Hollywood Tactics: Very much averted (disclaimer: future screw-ups not covered, but I shall at least try to take proper tactical advice).  The Legions are very keen on, among other things, formations, combined arms tactics, avoiding open-field battles, flanking, suppressing and covering fire, using all the available dimensions (even if #4 is tricky), destroying the enemy from well beyond visual range, commanding the battle from well behind the lines and preferably from orbit, etc., etc.

And while their training program is, in many ways, The Spartan Way, it is tempered with very advanced medicine (the sort of thing that makes Valhalla-style deadly live-fire exercises survivable) and the expertise of a great many psychedesigners in ensuring that it goes right up to the point at which tempering stops and snapping begins, and no further.

See also: Combat Pragmatist.