May I suggest a class?
Class name : Officer/Communicator
This class let's you call down air supports and artillery to help your teammates when they are pinned down by heavy enemy fires (or just to get kills or hold incoming enemies.)
By the sound of hearing that it could call down air supports and artillery fires, it might sound like it's overpowered. Well, it's not because this class only uses a pistol, and a knife (maybe a grenade too.) And to balance it out even more, there should be call durations which will last about 40 ~ 60 seconds or you should make it RTB pref so the host can either increase or decrease the call duration.
Basically, this class's inventory will be a pistol (M1911), a knife, and maybe a grenade, and a walky-talky or a SATCOM.
By having a strong advantage on calling for air supports and artillery fires, this class also has a big disadvantage because since it uses only a pistol for a firearm, this class is very vulnerable during the call duration.
After call duration reaches to 0, this class will be able to call for another air support or another artillery attack. Also if the minigame resets, or this class dies or killed, the call duration will reset.
Also to make it fair for the opponent team, each team will be given 1 or 2 Officer/Communicator spaces or you could also make another RTB pref for this.
I don't have any ideas about catchphrases, so I think you should try to make them.
And here is a suggestion on how should they look like.

Damn, I need a tablet...