DO THE FOLLOWING IN THE MISSION EDITOR:
1. Create a manned BLUFOR or OPFOR helicopter capable of transporting soldiers. (do not set special to "flying" for this specific replication)
2. Create a separate squad of soldiers outside of the helicopter you just created.
3. Give the squad leader of the squad you just created a waypoint order to "Get In" the transport helicopter you previously created.
4. Give the transport helicopter a waypoint order to "Transport/Unload" in a decent LZ (locations I tried to have heli unload at was a dirt road northwest of Agia Marina and a few random locations around and inside the small camp norhtwest of Camp Maxwell).