Heavy Cavalry Redux

“Drive me closer! I want to hit them with my sword!”

no-one with a tank, ever

This is a recreation/reformulation/retcon of the original description of the Empire’s heavy cavalry legions, in light of both criticism received – and assistance to resolve it – and rethinking of my own. It should be considered as a replacement for the original post here, et. seq.

Let us proceed.


Making up the remaining one of every sixteen legions (i.e., one per three light cavalry or heavy infantry, and one per nine light infantry), we have the heavy cavalry. Direct-fire death on very large treads, which is to say, main battle tanks. The biggest of all the big sticks. Putting the “brute” into “brute force”.

For additional flexibility, the majority of Imperial MBTs are built off a common base platform, with a selection of swappable modules to provide specific functionality for specific cases. (Unlike many modular vehicle systems in this ‘verse, however, these aren’t hot-swappable; the need to remove and replace and integrate large and complex chunks of armor plate, etc., when doing it means that this requires some pretty major machine-shop type facilities. It’s not something you can do in the field, and indeed something only seen at the most well-developed remote operating bases.) Due to these functionality differences, MBTs are usually classified by the module.

So first we’ll talk about the capabilities of the base platform, and then we’ll talk about some of the more commonly seen modules:


Base Platform

The base platform of the Imperial MBT is a low-slung vehicle with all-around glacis design, designed to minimize its target profile and give it a low center of gravity. In dimensions, it is approximately 12 m (39 ft) long, 4 m (13 ft) wide, and 3 m (10 ft) high; its total mass (varying, of course, by module), however, is of the order of 60 short tons, due to the extensive use of lightweight composites.

8 m of the length and 3.5 m of the width at the front is the module socket; height of modules varies, but none take it much above the basic 3 m height. At the rear of the platform, an externally-opening compartment can be used to hold resupply, infantry needing transport, or a “hot soup” fuel pod to increase vehicle endurance.

Armament

The armament of the base platform (effectively the secondary weapons systems common to all tank classes) is fitted in four altazimuth ball mounts, located on either side of the vehicle, towards the front and rear.

These mounts’ field of fire extends 180 degrees vertically, and approximately 160 degrees horizontally at zero vertical, i.e., limited only by the occlusion of that side’s other mount. In effect, they maintain full coverage to the side, front, and rear of the tank, with only a small gap in coverage to the front for the rear mounts, and to the rear for the front mounts.

The front mounts include coaxial ortillery target designators and heavy (72 mm) mass drivers/micromissile launchers; the rear mounts only include medium (36 mm) mass drivers.

(While the latter do spend much of their time firing forward and to the flank, their special purpose in being mounted where they are is to give you something to pop the drone lining up to shoot you in the ass with so you don’t have to stop engaging your main target while you do it. In their battlefield environment, micro-AKVs are cheap and plentiful, so this happens a lot. If you had to slew the main gun around every time, you’d be taking your eye off the ball way too much – even if you could get it to reliably track something that small and fast-moving.)

See also Point Defense, below.

Armor

The armor of Imperial MBTs is relatively standard for Imperial armored units; there’s just a lot of it. The core structural frame is honeycomb-patterned diamondoid composite, covered with multiple slabs of interlinked refractory cerametal (i.e., a ceramic-metal composite formulated for both great physical strength and resistance to heat), electrical and thermal superconductor meshes, more cerametal, reactive-armor sections, and an outer anti-energetic ablative coating to sprayed on top of it all. Additional side plating shields the rollagons. A nanopaste-based self-healing system runs through channels in the armor, keeping damage patched up in the field.

The survivability specifications on all this armor is that the vehicle should be able to survive a near-miss with a tactical-range nuclear weapon or equivalent orbital kinetic strike.

Command and Control

An Imperial MBT nominally crews three: semi-specialized commander, driver, and gunner positions; in practice, this is rendered a mite fuzzy inasmuch as they’re both ably assisted by the vehicle’s internal synnoetic (i.e., designed to function integrated with another sophont mind) AI, and linked to each other by internal conflux hardware (i.e., functioning as a loose, mesh-topology temporary group mind for maximal efficiency, enabling coordination and multitasking by splitting off semi-autonomous agents).

Primary control is routed through the AI and direct neural links – the vehicle seats are virtuality chairs, connecting to the crew’s implanted laser-ports – but auxiliary/backup manual controls are also available.

Core sensors and communications include all the standard options: radio and whisker laser communications, access to the OTP-encrypted tactical mesh, threat identification systems, teamware and C3I systems integration, thermal imaging, remote sensor access, and all-around local sensors including pulsed-usage radar and lidar, T-ray high frequency snoopers, ground-penetrating radar, target-painter detection – and, of course, plain old electronic visual and sound transmission, since the interior of the MBT is fully sealed and includes no direct visual paths.

The MBT also includes a battle computer capable of functioning as a major node in the tactical mesh, and a full ECM suite.

Drones

As with all other units of the Imperial Legions, the heavy cavalry too has its drone accompaniments, with each MBT having a pair of WMH-12 Skyorca drones attached to it for close air support, along with a pair of heavy ground drones matching its own tactical function.

Internal Environment

To the delight of those legionaries who like a little comfort in their soldiering, the internal spaces of an Imperial MBT are a comfortable – albeit confined – shirt-sleeve environment. (Climate control, leather seats, the works…)

This is partially because given the expense of building one of these anyway, throwing in a few civilized comforts is barely a blip on the budget, and partially because – well, anything that successfully penetrates the armor tends to leave the crew as a hundred-yard-long red/blue/silver-white/etc. smear on the ground behind the exit hole anyway, so there’s no point in having them sit around in full combat armor. A padded jacket and helmet are sufficient to prevent accidents from concussion and rough terrain.

The interior is also a fully sealed and controlled life support environment for NBCN protection and exotic atmosphere/vacuum use. This also renders all tanks amphibious tanks by default: once you’ve covered all the various atmospheric compositions and pressures you might need to operate in and discarded thereby air-breathing engines and other systems, you’ve built a vehicle that can shrug off submergence, too.You could drive a modern Imperial MBT from continent to continent across the ocean floor, given a case of rat bars and a good reason to try it.

Point Defense

The MBT is equipped, as all else is, with a military-grade kinetic barrier system.

For active point defense, the base platform is equipped with a mix of mini-autocannons (in altazimuth ball mounts) and laser emitters, laid out to ensure all-around coverage, and capable of independently and automatically targeting all incoming fire and close-in soft units, subject to target identification and prioritization routines set by the crew.

Power

It seems a little inappropriate to say that the MBT is also powered by a micro-fission “hot soup” reactor, inasmuch as, well, it ain’t that micro. It is “mini”, perhaps, compared to standard-sized fission reactors, but it’s as large as the thorium molten-salt kind gets. The bigger ones all tend to be the safer “pebble-bed” design.

Naturally, this is buffered through a large set of superconducting-loop accumulators to handle immediate power draws and provide backup power in the event that you lose the power reactor – enough to make a fighting withdraw, anyway, although not enough to continue an engagement with.

Propulsion

The Imperial MBT moves on neither wheels nor treads; rather, it sits atop eight semi-squishy rollagons, near-spheres of a “smart fluid” rotated electromagnetically from within the sealed main hull, enabling it to move with equal facility in any direction, at speeds of up to 150 mph on a good, flat roadbed. Note that this is not a drivetrain developed specifically for military purposes: modern civilian ground-cars use similar technology.

The propulsion system also has considerable electromagnetic control over the shape of the rollagons; while they don’t have them normally, if you need spiked wheels or some other shape-variation to cross some tricky terrain, it can provide them on demand; if need be, they can even form “paddle-propellers” for amphibious operation.

A limited vector-control/impeller system permits the tank to apply vertical thrust to itself; this is used primarily downwards on light-gravity worlds to keep ground pressure high enough for the rollagons to be effective, occasionally upwards to reduce ground pressure where the ground is soft, and even more occasionally to lessen the severity of falls, ground collapses, or deliberate drops from low-flying transport aircraft.

(It would theoretically be possible, on light-gravity worlds, to use it to make “skips” over obstacles or other short vertical jumps, but this is generally considered an excellent way to become skeet.)

Stealth and Masquerade

The Imperial MBT, much like the heavy infantry, supports only the most basic chameleonic coating and signature reduction features; the nature of the battlefield environment of the time is such that any heavy unit has a signature (in terms of heat, reactor neutrinos, and the EM pulse accompanying weapons firing) that can’t be baffled worth a damn. As such, designers concentrated on designing a vehicle that could “tank” (sic) incoming fire in the process of executing shock and awesome.

It should however be noted that this does not preclude the use of external decoys, or the use of signature modification systems to confuse terminal guidance of incoming weapons, or indeed to masquerade as something else — but these systems have to work with the platform’s high signature, not try to conceal it.


Module: Tactical Assault Tank (HV-10 Basher-class)

As close as it comes to a “standard” MBT design, the HV-10 Basher-class module loadout is similar to the V40 Ralihú IFV, scaled up; the Basher-class comes with a turreted super-heavy (144 mm) mass driver, but substitutes a bilateral quadbarrels with limited independent training for the Ralihú’s single coaxial quadbarrel.

(The heavy mass driver is also designed to function as a heavy micromissile launcher, if required, and as such is entirely capable of delivering large-diameter canister shot for anti-infantry work.)


Module: Long-Range Assault Tank (HV-12 Stormfall-class; also HV-12i Longeye-class)

The HV-12 Stormfall-class LRAT module is equipped with a turreted super-heavy (144 mm) mass driver intended to be capable of long-range indirect as well as direct fire, but substitutes the quadbarrels for bilateral “pop-out” missile pods, each capable of doing a simultaneous launch of up to 16 minimissiles, reloadable with a short cycle time from internal magazines. Just perfect for those days when you want to fight in the shade.

By changing the minimissile loadout of the Stormfall, it can also serve as an active air-defense platform.

Rarely seen is the HV-12i Longeye variant, which trades in both super-heavy mass driver and missile pods for a graser installation, suitable for direct fire only but capable of punching out even more heavily protected targets. Also, notably, the Longeye graser is often capable of penetrating the atmosphere and reaching targets in low planetary orbit.


Module: Drone Tank (HVC-14h Thunderbolt-class; also HVC-14l Stinger-class)

A drone tank, in legionary parlance, is the land-based miniature equivalent of an aircraft carrier. The HVC-14h Thunderbolt module contains nanoslurry and miniature drone components, which it uses to construct and deploy ad-hoc micro-AKVs to suit the requirements of the current battlespace, launching them into action as a centrally coordinated wing, for defense, reconnaissance, attack, or other functions.

(Or, to put it another way, it’s a self-propelled field factory that spews out custom drones and minimissiles on demand, simplifying your logistics and multiplying your options.)

The HVC-14l Stinger functions similarly, but substitutes swarm hives for the micro-AKV factory, and is thus able to saturate the local battlespace with microbot/nanobot swarms, be they the standard eyeballs, shrikes, gremlins, or balefire, or more specialized models.


Module: Tactical Arsonier (HV-10a Flammifer-class)

Used for cleaning up or eliminating nanoswarms (highly vulnerable to thermal overloading), area denial, reducing bunkers and dug-outs, and spreading pure terror, the Flammifer-class replaces the heavy mass driver of the Basher-class with a scaled-up nuclear-thermal flamer, while retaining the quadbarrels as-is.


Module: Command Tank (HV-10c Strategos-class)

The Strategos-class is a specialized vehicle for coordinating tank-squadron activities and close air support. The Strategos module doesn’t add any weapons systems; rather, it adds two more crew positions for squadron command, a specialized tactical/logistics C3I AI, and a nodal communications suite and its antennae.

A pair or triplet of Strategoi are usually assigned to a tank squadron made up of other classes for command/control functions.


Module: Pummel (HV-11 Pugnacious-class)

The pummel tank is a highly specialized variant, designed to rip apart buildings and fortifications. It carries sappers in its rear compartment, and is equipped with specialized demolitions equipment up front.


Module: Wrecker (HV-10w Trison-class)

Another highly specialized variant, the HW-10W Trison and other wreckers are logistics units, used to recover wrecked tanks and other heavy equipment off the battlefield for repair or for scrap.


Transportation

The Flapjack-class cavalry dropship was made specifically for this; apart from that, they mostly drive to wherever they’re needed, because only the biggest transport aircraft can carry them in useful numbers.

Trope-a-Day: Tank Goodness

Tank Goodness: Oh, definitely, including all of Spider Tank, Hover Tank, and Drill Tank.  (Not Land Battleships, though – too easy for ortillery to target.)  But also, of course, the good old-fashioned ground tanks, like the HV-10 Basher or the HV-12 Stormfall and their variants (p.s. click that link for tank porn), are still more than present on the modern battlefield, as it has been since the days when war cars were steam-spouting behemoths.

Of course, it’s much more fun now that they come with enough armor and engine to drive through buildings, enough nuclear-shell enabled guns to fire town-leveling broadsides, and full closed-cycle environmental support sufficient to drive across – under – reasonably sized oceans – as long as you packed a lunch – now isn’t it?

Trope-a-Day: Military Mashup Machine

Military Mashup Machine: Oh, several.  Examining them by the categories of the original trope, we have:

Land Battleship: This one, actually, they don’t have.  Essentially, by the time it was practical to build this sort of thing, firstly, people who needed a heavy weight of fire on the ground were already in the habit of calling down the ortillery, either from the orbital defense grid or from an assault cruiser in low orbit over the battlespace – if they had orbital superiority.  And secondly, anything like this that you did build would be a giant radiating target for said ortillery – if you didn’t have orbital superiority.  Between them, these put paid to the notion of serious land battleships.

Submersible Carrier: Many wet navies have these, but they tend to be less the “plane-launching submarine” type and more submarines that can launch UAVs from missile tubes, control them for the duration of their mission, and then recover them at sea.  Which isn’t to say that the former haven’t existed, but the latter are usually rather more practical.

Amphibious Tanks: All tanks are amphibious tanks, pretty much by default.  By the time you’ve built a tank that can operate in all the various atmospheres, by composition and pressure, you might want it to (quick deployment and the needs of logistics sneer at air-breathing engines!) and incorporated the rest of the closed-cycle support you need to survive a modern battlefield in which nuclear, chemical, and nanoweapons are all in play, it pretty much shrugs off submergence, too.  You can pretty much drive a modern Imperial MBT from continent to continent across the ocean floor, although I can’t imagine why you’d want to.

(Incidentally, since a very large number of them have some vector-control capability and/or nuclear-thermal thrusters, they also arguably qualify as flying tanks – which usage, however, is a fast ticket to a court-martial, since playing flying games with something whose speed and maneuverability is very much not equal to dedicated air vehicles is a good way to win the Expert Pop-Up Target Award for your next instantiation.  It does, however, let you deploy your tanks with speed and convenience by kicking them out of the back of freight aircraft, and letting them ride their vectors to the ground.)

Amphibious Jet Fighter: Jet fighters, no, but we do have amphibious spacecraft – both certain shuttles common in orbital operations on worlds, water or otherwise, with extensive undersea development, and some types of system-defense vehicle whose ability to operate relatively deep in the atmospheres of gas giants – important to prevent enemy forces from field refueling, one way or another – permits operating in more terrestrial worlds’ oceans, which can be useful from time to time as a way to hide out and achieve surprise.

(It’s probable that gas-giant installation service vehicles and gas miners could also operate successfully in an oceanic environment, but there’d not be any point other than, well, saying that you’d done it.)

Mobile Factory: Even if you ignore the two hyperdreadnoughts with full on-board shipyards and the six Supremacies that act as semi-mobile bases for the fleets to coreward, rimward, spinward, trailing, acme and nadir, the Imperial Navy has to operate so often well outside reasonable resupply lines that it operates a large number of mobile logistics bases, large ships – with their own attached screens, parasite smelterships, etc. – which can be stationed anywhere to build new fuel, supplies, ammunition, and even AKVs to resupply task forces operating in their vicinity, using resources available locally.

And if we’re classifying the Cylon resurrection ships from Battlestar Galactica here, then we should also include the hospital ships – a historical designation – operated by large numbers of transsophont powers, which serve both as a well-protected place to keep the mind-state backup substrate, and also to house the large number of military-spec clone bodies used to resurrect anyone killed in action and send ’em back into the fray.

(If you manage to take one of these out, or even if you don’t, yes, this means that the number of bodies left floating around the battlefield afterwards bears no resemblance whatever to the number of people you actually managed to kill.  Assuming that you managed to kill anyone permanently, which – since most militaries that make use of this particular technology offer off-line backups back at base as a service benefit – is, frankly, doubtful.)

The Battlestar: Well, as mentioned above in the specific trope of that name, there are several battlecruiser classes that are designed like this, simply because the on-board AKV screen gives them much greater flexibility when they’re out running patrols and such on their own or in small flotillas, rather than being retained as fleet screening elements.

And then there are the fleet carriers which carry around entire task forces between those star systems not linked by stargates, when necessary.

Others: While these do a good job of describing the main variations, there are plenty of other weird vehicles hanging around in larger or smaller numbers: burrowing tanks for special siege applications;

The Pindareth-class aerospace-support cruiser, a flying Macross Missile Massacre whose whole design function is to dump entire holds’ worth of bundles of air-to-anything missiles into the battlespace from orbit, then designate targets for them once they hit operational altitude, intended to swarm and destroy entire air forces in one giant orgy of nucleonic destruction;

And, on the personal level, a number of gunsword designs which, yes, turned out to be pretty useless as guns and swords both, but which, after being corrected to not throw off the balance and forgetting about the projectile, work great for extracting your sword from someone if you should get it hung up on some resistant bit of innards.

Heavy Cavalry: Size

Just occurs to me, I wrote all that and never once mentioned a size.

Well, the base platform is about 16.5 m (54 ft) long, 4.8 m (about 16 ft) wide, and 3.6 m (about 12 ft) high. For reference, that’s about twice as long as an M1 Abrams and a third again as wide, comparable in length to a short semi-truck. (Not exactly intended for fighting in cramped urban conditions, but then, that’s why the drive train is built with pleasing indifference to the direction you might ask it to drive in.) 8 m of the length and 3.5 m of the width at the front is the module socket; height of modules varies, but none take it much above the basic 3.6 m height.

Fortunately, it doesn’t actually weigh all that much more than the Abrams, thanks to extensive use of newfangled lightweight composites.

So now you know.

The Emperor’s Sword: Heavy Cavalry

“Bash, bash, bash, bash, bash our way to glory…”

Making up the remaining one of every sixteen legions (i.e., one per three light cavalry or heavy infantry, and one per nine light infantry), we have the heavy cavalry. Direct-fire death on very large treads, which is to say, main battle tanks. The biggest of all the big sticks. Putting the “brute” into “brute force”.

For additional flexibility, the majority of Imperial MBTs are built off a common base platform, with a selection of swappable modules to provide specific functionality for specific cases. (Unlike many modular vehicle systems in this ‘verse, however, these aren’t hot-swappable; the need to remove and replace and integrate large and complex chunks of armor plate, etc., when doing it means that this requires some pretty major machine-shop type facilities. It’s not something you can do in the field.) Due to these functionality differences, MBTs are usually classified by the module.

So first we’ll talk about the capabilities of the base platform, and then we’ll talk about some of the more commonly seen modules:

Base Platform: Armor

The armor of Imperial MBTs is relatively standard: there’s just a lot of it. A honeycomb-patterned diamondoid-composite structural frame, covered with multiple slabs of interlinked refractory cerametal, electrical and thermal superconductor meshes, more cerametal, reactive-armor sections, and an outer anti-energetic ablative coating sprayed on top of it all, with additional side plating to shield the rollagons (see below), and an inbuilt nanopaste-based self-repair system. The survivability specifications on all this armor is that the vehicle should be able to survive a near-miss with a tactical-range nuclear weapon or equivalent orbital k-kill strike.

The entire vehicle is itself low-slung, to minimize its target profile, and keep the center of gravity low. Much like the heavy infantry, though, they don’t bother with significant chameleonic or stealth features, since there is absolutely no way to render one remotely stealthy.

Base Platform: Command and Control

An Imperial MBT nominally crews three: semi-specialized commander, driver, and gunner positions; of course, this is a mite fuzzy inasmuch as they’re both ably assisted by the vehicle’s internal synnoetic AI, and indeed linked to each other and the AI by internal conflux hardware, functioning as a loose, mesh-topology group mind for maximal efficiency. Primary control is routed through the AI and direct neural links – the vehicle seats are virtuality chairs, connecting to the crew’s implanted laser-ports – but auxiliary/backup manual controls are also available.

Core sensors and communications include all the standard options: radio and whisker laser communications, access to the OTP-encrypted military mesh, threat identification systems, teamware and C3I systems integration, thermal imaging, remote sensor access, 360 degree sensing, pulsed-usage radar and lidar, T-ray high frequency snoopers, ground-penetrating radar, target-painter detection – and, of course, plain old electronic visual and sound transmission, since the interior of the MBT is fully sealed and includes no portholes.

The MBT also includes a major-node-grade battle computer, and a full ECM suite.

Base Platform: Internal Environment

To the delight of those legionaries who like a little comfort in their soldiering, the internal spaces of an Imperial MBT are a comfortable – albeit confined – shirt-sleeve operating environment. (With climate control! And leather seats!)

This is partly because given the expense of building one of these things anyway, throwing in a few civilized comforts is barely a blip on the budget, and partly because – well, anything that successfully penetrates the armor tends to leave the crew as a hundred-yard long red/blue/silver-white/etc. (delete as applicable) smear on the ground behind the exit hole anyway, so there’s not much point in having them sit around in full combat gear.

This is also fully sealed and environment-controlled for NBCN protection and exotic atmosphere/vacuum use. It also renders all tanks amphibious tanks by default: once you’ve covered all the various atmospheres and pressures you might need to operate in, and obviously discarded air-breathing engines, you’ve built a vehicle that can shrug off submergence, too. You could drive a modern Imperial MBT from continent to continent across the ocean floor, given a case of rat bars and a good reason to try it.

Base Platform: Loadout

The base platform loadout includes a pair of bilateral cheek-mounted ortillery target designators, heavy mass-drivers, and slugguns/micromissile launchers at the front, on either side of the module mount and the armored prow (used for ramming/demolition), and a pair of rear-facing cheek-mounted medium mass-drivers at the rear for local defense. Completing the mix, a center-top-mounted “backscratcher” (a projector for downward-firing flechette shells) permits the vehicle to rid itself of pesky close-in infantry.

(Along with, of course, full-coverage point-defense lasers and autocannon, independently and automatically targeting all incoming fire.)

At the far rear of the tank, an externally-opening compartment can be used to hold resupply, infantry needing transport, or a thermal-thruster fuel pod to increase vehicle endurance.

Base Platform: Power

It seems a little inappropriate to say that the MBT is also powered by a micro-fission “hot soup” reactor, inasmuch as, well, it ain’t that micro. It is “mini”, perhaps, compared to standard-sized fission reactors, but it’s as large as the thorium molten-salt kind gets. The bigger ones all tend to be the safer “pebble-bed” design.

Naturally, this is buffered through a large set of superconducting-loop accumulators to handle immediate power draws and provide backup power in the event that you lose the power reactor – enough to withdraw, anyway, although probably not enough to fight with.

Base Platform: Propulsion

The Imperial MBT moves on neither wheels nor treads; rather, it sits atop eight semi-squishy rollagons, near-spheres rotated electromagnetically from within the sealed main hull, enabling it to move with equal facility in any direction, at speeds of up to 150 mph. The propulsion system also has considerable electromagnetic control over the shape of the rollagons; while they don’t have them normally, if you need spiked wheels or some other shape-variation to cross some tricky terrain, it can provide them on demand.

The base tank platform also includes a limited – by power availability and overheating, given the high mass of the vehicle – vector-control/nuclear-thermal thruster flight capability. This is typically used for skipping over tank traps, scaling vertical obstacles, and short ground skims, as well as being used in reverse to keep the vehicle on the ground with sufficient ground-pressure for the rollagons in low-gravity environments; since the vehicle has the approximate maneuverability of a lead brick in the air, it is strongly advised not to try to use it for anything more, lest you suffer from a fatal encounter with a real aircraft.

It does, however, greatly ease deployment from transport aircraft or shuttles, when used, since it lets you kick the tank out the back of the aircraft and ride their vectors safely to the ground.

And now, the modules:

Modules: Tactical Assault Tank (HV-10 Basher-class)

As close as it comes to a “standard” MBT design, the HV-10 Basher-class module loadout is similar to the V40 Ralihú IFV, scaled up; the Basher-class comes with a turreted heavy mass driver, but substitutes dual independently turreted quadbarrels for the Ralihú’s coaxial quadbarrel. (The heavy mass driver is also designed to function as a heavy sluggun, if required, and as such is entirely capable of delivering large-diameter canister shot for anti-infantry work.)

Modules: Long-Range Assault Tank (HV-12 Stormfall-class; also HV-12i Longeye-class)

The HV-12 Stormfall-class LRAT module is equipped with a super-heavy mass driver intended to be capable of long-range indirect as well as direct fire, and bilateral missile pods on either side of it, each capable of doing a simultaneous launch of up to 16 minimissiles with a short cycle time from internal magazines. Just perfect for those days when you want to fight in the shade.

By changing the missile loadout of the Stormfall, it can also serve as an active air-defense platform.

Rarely seen is the HV-12i Longeye variant, which trades in both super-heavy mass driver and missile pods for a graser installation, suitable for direct fire only but capable of punching out even more heavily protected targets. Also, notably, the Longeye graser is often capable of penetrating the atmosphere and reaching targets in low planetary orbit.

Modules: Drone Tank (HVC-14h Thunderbolt-class; also HVC-14l Stinger-class)

A drone tank, in legionary parlance, is the land-based miniature equivalent of an aircraft carrier. The HVC-14h Thunderbolt module contains nanoslurry and miniature drone components, which it uses to construct and deploy ad-hoc micro-AKVs to suit the requirements of the current battlespace, launching them into action as a centrally coordinated wing, for defense, reconnaissance, attack, or other functions.

The HVC-14l Stinger functions similarly, but substitutes swarm hives for the micro-AKV factory, and is thus able to saturate the local battlespace with microbot/nanobot swarms, be they the standard eyeballs, shrikes, gremlins, or balefire, or more specialized models.

Modules: Tactical Arsonier (HV-10a Flammifer-class)

Used for area denial, reducing bunkers and dug-outs, and to clean up nanoswarms, the Flammifer-class replaces the heavy mass driver of the Basher-class with a scaled-up nuclear-thermal flamer, while retaining the quadbarrels as-is.

Modules: Command Tank (HV-10c Strategos-class)

The Strategos-class is a specialized vehicle for coordinating tank-squadron activities and close air support. The Strategos module doesn’t add any weapons systems; rather, it adds two more crew positions for squadron command, a specialized tactical/logistics C3I AI, and a nodal communications suite and its antennae.

A pair or triplet of Strategoi are usually assigned to a tank squadron made up of other classes for command/control functions.

Modules: Pummel (HV-11 Pugnacious-class)

The pummel tank is a highly specialized variant, designed to rip apart buildings and fortifications. It carries sappers in its rear compartment, and is equipped with specialized demolitions equipment up front.

Modules: Wrecker (HV-10w Trison-class)

Another highly specialized variant, the HV-10w Trison and other wreckers are logistics units, used to recover wrecked tanks and other heavy equipment off the battlefield for repair or for scrap.

Drones

As with all other units of the Imperial Legions, the heavy cavalry too has its drone accompaniments, with each MBT usually having a pair of WMH-12 Skyorca drones attached to it for close air support, along with a pair of heavy ground drones matching its own tactical function.

Transportation

The Flapjacks were made for this. Apart from that, they mostly drive to wherever they’re going, because only the biggest transport aircraft can manage to carry them.

Trope-a-Day: Hover Tank

Hover Tank: Some lighter tanks are, indeed, vector-control vehicles which can hover (and fly briefly to hop over obstacles, although using this as an extended flight capability is discouraged, due to the high probability of a fatal encounter with a real aircraft).  Their strengths are in speed and maneuver (and, of course, the side-to-side strafe), but they’re relatively fragile and have to stick to relatively light weapons lest they burn lots of fuel counteracting weapon recoil, etc., so their main usage is in the scouting/harassment/fast-attack role.  Main battle tanks are still the traditional heavy, tracked vehicle.

While the trope disclaims these as being members, they were preceded by military hovercraft in a more restricted version of the same role.