ARVs may have winches, jibs, cranes, and/or bulldozer blades to aid in tank recovery. Typically, any specialized lifting and recovery equipment replaces the turret and cannon found on a regular tank. ARVs may in some cases have electric generators, blowtorches, chainsaws and fuel pumps to help with recovery operations, or spare parts, to facilitate field repairs. Some ARVs have a spade component to anchor the vehicle when it is towing or lifting. Since most ARVs are based on tank or APC chassis, they have an armored crew cockpit and engine, which means that ARVs can be operated in combat conditions. Rarely, an ARV may be armed, such as some M32s, which have an 81 mm mortar for screening purposes, and the M88, which has a .50 cal heavy machine gun. One WWII Sherman-based ARV had a dummy gun installed where the turret would normally go.