During the American Civil War, the Union placed soldiers invalided by debilitating wounds into a pool known as the Veteran Reserve Corps.
http://en.wikipedia.org/wiki/Veteran_Reserve_Corps
(Wikepedia, I know, but for the most part it looks accurate.)
This group was used to free up able-bodied troops from rear area duties like guarding railroad bridges, headquarters, and supply depots, as well as basic logistical and clerical jobs, thus increasing the combat power of the regular army. I think that armies late in the Twilight War would employ their disabled (from a front-line combat duty, POV) and/or convalescing soldiers in a similar fashion. I've already posited some thoughts on the role of wounded warriors in T2K here:
http://forum.juhlin.com/showthread.p...state+army+t2k
See post #38.
Troops from such a unit could add a little flavor to a T2K campaign. I can also see other armies, allied and enemy, fielding the same sort of units in the same sorts of roles. For a group that really wants to get into some serious, unconventional RP'ing, drawing a PC party from such a unit could provide an interesting and formidable challenge.