I need is different types of harness\litters
Well might i suggest a big magnet for picking up tanks and vehicles, a rope line for picking up ammo boxes (wouldn't the enemy be mad if you went and stole their ammo ;D ), a winch on the side of the chopper (would only probably work with the Black Hawk) for rescuing people (the person on the rope would be pulled up into the chopper).
The rescue chopper one could open up possiblities in mission making because there would be rescue missions to the front line where the chopper would be a siting duck if it landed but sence it is it the air it could fire its guns and provide covering fire as wounded men were hauled up the winch. And the last man as he is being hauled up falls off/shot off the harness and falls to his death. That would make a great cut scene at the begining of a mission. Then the chopper flies back to base to where the player is being suited up to be paradroped behind the enemy front line and destroy some stuff.
Fast forward
(final cutscene) The player is wounded and a rescue chopper comes to pick him up but the player tells it to go find other wounded people and that he (the player) is fine. The chopper flies away in to the sunset and the player dies :'( .