[Legbreaker]

Back in the early 90's, it was said that for every soldier in a combat role, there were 10 soldiers in supporting roles.
I think there'd be plenty of positions available for non combat officers what with the extra supply needs for a division in 2000 - food collection/production, fuel distilation, ammo reloading, vehicle (and resource) recovery and repair, training of new recruits, retraining of other non combat soldiers (or combat soldiers too wounded to continue in their previous carreer) etc, etc, etc.

With regard to how combat troops treat non combat officers, Rank is still Rank. Sure they might not be all that respectful when they're not around, but if military discipline is still in force, they're going to listen and obey (at least until the officers back is turned) or risk disciplinary action.

Now the officer in Rae's initial example is unlikely to be directly transfered into an Infantry unit BUT would serve quite well in a supporting role at Battalion level or in a supporting unit. This would free up a trained infantry officer to move into a combat role (and be a bit annoyed they'd been pushed out of their comfy rear eschelon desk job and back onto the pointy end).