In most maps 1-2 crates spawn at random intervals on the map. They are to be regarded as a resource and collected with care. The can grant you money, points, weapons, strange powers, If your lucky a vehicle. If you are not lucky they can kill you or take all your weapons away.

A vehicle received by a crate can be from the other team. If this is the case it is noted that it counts against the other teams vehicle limit and should be regarded as a captured tank

The stealth crate grants the user the stealth ability used by the stealth black hand and the Stealth tank. If the user of a stealth crate enters ANY vehicle. The power will be moved from the player to that vehicle. You are expected to report to base and stealth a vehicle before going back to crate humping or what ever it was you were up to.