If in Skirmish you abandon a vehicle (like, to get out and use a PT), and some traitorous AI walks by, he'll just... take it.
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Am I missing some kind of vehicle lock function? (Though I think I shouldn't have to lock it around my own teammates...) Perhaps it makes sense for them to pick up a vehicle if you die in the enemy's base, sure, but I don't feel like this particular theft is desired.