anyway, as said, ejecting and walking home would be the way to go. However, it should also be possible for an escapee (or pod in alleg terms) to jump in a vehicle that has a seat left over:
"so your tank got blown up? Hop in, we still got a seat at the turrets".
This would also enable players to switch vehicles in the battlefield and it even allows the dropping of more advanced or more apropriate vehicles by dropships or other kinds of transports (hover transports perhaps?)