It is possible. I have done in BF3 in conquest on the Gulf of Oman map on RU team, at US aircraft carrier in their venom. Basically I parachuted to their base then got in the venom and 3 seconds later there was a white name as a gunner.
I check the score board and notice the white named person wasn't on my team and that it was an enemy. After driving the stolen venom back to main land I get destroyed by the viper. I still don't know how it happened and I know it was a glitch and not a bug or mod.
