The military also deploys tow trucks for recovery of stranded vehicles. In the US Army, a variant of the HEMTT truck is used for this purpose, the M984 wrecker. For recovery in combat situations while under fire, many armies with large vehicle fleets also deploy armoured recovery vehicles. These vehicles fulfill a similar role, but are resistant to heavy fire and capable of traversing rough terrain with their tracks, as well as towing vehicles beyond the weight limits of wheeled wreckers, such as tanks (many are based on tank designs for this very reason).