The Volcano system (M87) ( Figure C-12) replaced the older M56 helicopter-delivered AT mine system and the GEMSS/Flipper system. The M87 is a mixed system and the M87A1 is a pure AT system. Volcano dispensers can be mounted on several tracked or wheeled vehicles or on the UH-60 Blackhawk helicopter. The system is made up of the launcher rack and dispenser-control unit, vehicle-specific mounting hardware, and mine canisters, each of which holds six mines. A completely loaded dispenser holds 160 canisters, or 960 mines. The mines are placed in a uniform density of approximately one mine per linear meter over a linear distance of one kilometer. Self-destruct times of 4 hours, 48 hours, or 15 days are set at launch time. The Volcano system can be used to emplace protective and tactical minefields anywhere on the battlefield reachable by the dispensing vehicles.