Operational availability, often written Ao, is a measure of how often a piece of equipment is ready to perform its mission when needed. It depends on how reliable the equipment is and how quickly it can be repaired.
Recovery vehicles are armored vehicles designed to tow, lift, or repair disabled tanks and other vehicles on the battlefield. Examples include armored recovery vehicles used by many armies. Having enough of them and keeping them ready can help restore damaged equipment to service and keep operational availability high.
Planners weigh the number of vehicles, spare parts, trained crews, and maintenance facilities when estimating availability. A fleet may look large on paper but have low availability if support is inadequate.