If ever you find yourself in the unfortunate position of not being able to airdrop vehicles or armor, you can easily hijack one of the enemies', even while the vehicle is still being used against you. First of all, you'll need to be playing as J.D. Tyler for it to be at all easy; since J.D. has the most accurate weapons. Second, the enemy tank's commander will always have his head sticking out of the turret hatch, so if you kill him, all weapons on the tank will suddenly stop firing. Since the driver is inside the tank, the tank will just keep driving around, and you will need to catch up with it, and if you can get close enough you'll be able to get inside. When you have entered the tank, the other tank crew members will immediately get out, and you have yourself a tank! German vehicles are usually superior to your own, so make good use of them.