caliber (12.7 mm) GAU-15/A, GAU-16/A, or GAU-18/A machine guns, or 7.62 mm M60D machine guns. The .50 caliber weapons were later supplanted by the .50 caliber GAU-21/A machine gun, which featured a higher rate of fire. UH-60 Black Hawk/SH-60 Sea Hawk/HH-60 Jayhawk/HH-60/MH-60 Pave Hawk M139 The M139 Volcano is a mine dispenser system composed of racks on both sides of the aircraft for up to 40 Canister, Mine, M87. Each canister contains 6 GATOR Anti-Tank mine and 1 GATOR Anti-Personnel Mine. M144 The M144 is a defensive subsystem that provides mounts and cradles at the two windows between the pilot doors and the main cabin doors on the UH-60 series of helicopters, each mounting a single M60D 7.62×51mm machine gun. The US Army phased out the M60D in favor of the M240D and subsequently M240H, or M-134 Miniguns, but it is unknown whether the necessity of a new cradle for the weapon resulted in the system being redesignated. The mount is otherwise the same. The USAF equips its HH-60/MH-60 Pave Hawk with one or two GAU-15/A, GAU-16/A, or GAU-18/A .50 caliber machine guns, and or GAU-2 series 7.62mm NATO Miniguns. Example; One .50 caliber MG in the floor, firing out of an open door and two 7.62mm NATO miniguns mounted in the door gunner positions. ESSS The External Stores Support System (ESSS) provides two stub wings each with two hard points primarily for external fuel tanks, but, it can also carry various weapon systems. When equipped with the Extended Range Fuel System (ERFS), the system can support two 870 L (230 gal) or 1,700 L (450 gal) external tanks. The system feeds into the main fuel tank and not the engines directly. The ESSS can also be fitted with a wide range of weapons including up to sixteen AGM-114 Hellfire missiles, rockets and gun pods, and other systems. AN/AWS-2 RAMICS The Rapid Airborne Mine Clearance System (RAMICS) can be considered an armament subsystem (and one of the largest guns ever fitted to a helicopter), though its intended targets are strictly naval mines. Consisting of a single modified Mk 44 Mod 0 30mm cannon firing the Mk 248 Mod 1 Armor-Piercing Fin-Stabilized Discarding-Sabot Tracer (APFSDS-T) round, the RAMICS was intended to be mounted in the cabin of the MH-60S helicopter, and using its associated sensor package, target and neutralize mines at relatively shallow depths. The system is designed to provide a