Okay how about this.
MM, Mabe this would work.
The C47 Pilot Selects the Cargo and takes off from the AF, After flying to the target with 10 Cargo in its hanger, People Join the C47 with .Join ******, this then select the player to a cargo number, and so. When the C47 drops the cargo onto the ground near or closs to the base ( Only 10) the cargo that has been joined by the player, Turns into the a Player selection for the Vehcles that he or She want.
This enable 10 people to be droped off by a field or close too one. then they get to select there best rid and go and try to take the base.
Its one other idea. It means it limites the spawn point, and if only 5 people join the C47 the rest of the cargo just blows up.