First of all, Helicopters aren't "PARACHUTABLE."
I think you can add PARACHUTABLE as their KindOf, though I cannot guarantee desired results.
I tried replicating this[at 9 seconds of video onwards]:
?t=9
I have a "fake" helicopter parachute from the plane and kill itself to activate its OCL to spawn the real helicopter.
But the Helicopter will always spawn from the ground. So hm.
ANYWHOO
Unless Comanches aren't exactly the most potent thing in your mod, then its okay.
I'd rather it just have Humvees to drop.
Either that, have make it drop Avengers-- those buggers are expensive and their only good against anti-air(Unless you heavy ground as Airforce Gen, I mean, who does that?).