Answering some questions, addressing some misconceptions and refuting one outright falsehood:
The Corps of Cadets will be on holiday leave, so the Corps will not march-on. There will certainly be some cadets at the game. I will be VERY VERY surprised if there is a march-on of that group. One big reason is that there isn't a chance to practice the march-on since everyone will be away.
All cadets get paid the same amount, whether they're the starting QB or a plebe who can barely pass the fitness test. Plebes have a LOT of expenses taken out (initial uniform issue, computer purchase, etc) but expenses decrease with each subsequent year. This means that "take home" pay for seniors (called "Firsties") is higher than it is for plebes.
All cadets and midshipmen at ALL service academies get paid, so whoever posted that their cousin/friend/whatever attended the Air Force Academy and they didn't get paid, that's definitely false.
Cadet football players CAN opt out of the bowl, some did last year. HOWEVER, the ones who opted out were ones who had already announced that they were entering the portal (cadets have no post-West Point obligation if they leave before classes start their junior year). This translates to no juniors or seniors opting out.
The very overwhelming majority of Army's contributors are juniors and seniors (all of the starters and all but maybe 2 of the backups on O and D are juniors or seniors).