I honestly thunk it would be a really cool addition cobsidering models of them already exist in JAM (Jet Attack Move).
It could be a usefull Unit or a Squad
Example: Ground Unit Support, or CAS.
Heli Ideas: Mil Mi 17, AH 64, UH-60, Little Bird.
Heli types:
Support : Missiles,Miniguns, Dropping off Soliders.
Resupply : Air drop Vehicles, or Ammo/Other Supplies.
Cargo: Self Explanatory.
Honesly Cool Idea for the game!