Improbable Aiming Skills: Training for the various sentinel occupations, including the Imperial Legions and, yes, also the Watch Constabulary tries its best to achieve these, or at least to avert Imperial Stormtrooper Marksmanship Academy really hard.  In these modern days in which you can have a top-flight ballistics software package running in your head and arbitrary amounts of computer power, locally networked sensors, etc., etc., in your gun – well, let’s just say that the standards for improbable have been raised a tad.