[quote=Lugia]
I was trying to find a term to refer to all of them. Yes, I know that there's a specific class called the soldier, but, they're all in some way, shape, form, or what-have-you in the military to some degree.
[/quote]
Class, mate.

NONE of them (even the Soldier) have been in the army. If anything, the Medic regards very little respect to the Hippocratic Oath, and the Demoman is just a drunken Demoknight with explosives.

You're talking about Team Fortress Classic. Even then, we still can't confirm if they've served for their countries.