Remove the crew
Follow by giving all USF vehicles an ability to:
Self repair and capture territories (activatable at the same time)
(A vehicle that spend 5+ secs under small arms fire in repair mode gets abbandoned, 10+ secs for capping mode)
A new ability for US armor: Transfer- vehicle is reassigned into teammates army
A new mechanic for US armor: If T is pressed at the right time before the vehicle dies, a vehicle crew unit hits the field
Like it.
But instead of the last thing there could be simply the chance to spawn a damaged squad out of the destroyed verhicle.