I'd imagine that all the base facilities would have general support staff and people to operate them, although isn't that assumed that those personnel are already accounted for and paid by general monthly upkeep costs of individual base facilities? I think Winter is right, and that implementing controls for managing those general personnel just isn't worth it - Yes, there are probably cooks who prepare meals, technicians for operating equipment, people who inspect and re-fuel aircraft, mechanics and techs to reload, install, and change aircraft weapons/equipment, computer techs to fix when the base's email-system in the computers aren't working, cleaning crews to vacuum and dust, etc., but the point I'm making is that those lesser people are unimportant, and not worth implementing hire/fire/control screens for because they add unnecessary complications into the game and again are probably already covered for with general operating costs of the base facilities. Adding controls for them would slow down gameplay and just wouldn't be a good idea because of that.
The same goes for the hospital - real life hospitals have lots of general staff, not just doctors, but in this game I don't think it would be worth it to implement micromanaging them.