The leader of a grp. will always be the man to tell his boys to get out,
and thus, if YOU are the boss inCargo, the game engine awaits YOU to tell the men to disembark
Now, if you wanna try this out, change player character to a regular trooper
that would show ya that the AI-leader now says "all disembark" or alike
(this is if you're NOT grouped to the chopper, but just "moveincargo" or get in cargo with yer grp.)
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PS.
Off course, if you really WANNA be the grp. leader and still want
the whole grp to get kicked out once the bird is on the ground, just
use a bail script that will fire when the bird is at 3-5 mtr's above ground.
Later m8