Gun, 100mm M1944 Soviet-built, dual purpose field and antitank gun introduced toward the close of World War II; it weighs 7,628 pounds, is 30.9 feet in length and has a muzzle velocity of 900 meters per second. Maximum range is 21,000 meters and maximum rate of fire is 8-10 rounds per minute. Is recognizable by long tube, double-barrel muzzle brake, dual wheels, and sloping shield. Gun, 130mm Soviet-built fieldpiece which utilizes either a limber for transport or is self-propelled. Towed weapon weighs 19,000 pounds, is 38 feet in length, and has a muzzle velocity of 930 meters per second. Maximum range is 27,000 meters and maximum rate of fire is 6-7 rounds per minute. Tube has a multi-perforated muzzle brake. Gun, 175mm U. S.-built, self-propelled gun which weighs 62,100 pounds and fires a 147-pound projectile to a maximum range of 32,800 meters. Maximum rate of fire is 1/2 round per minute. Hand Grenade, U. S.-manufactured, hand-thrown bomb, Fragmentation which weighs approximately one pound, M-26 and contains an explosive charge in a body that shatters into small fragments; it has an effective range of 40 meters. H&I Harassment and Interdiction H&S Co Headquarters and Service Company HistBr Historical Branch HMM Marine Medium Helicopter Squadron Howitzer, 105mm U. S.-built, towed, general purpose light M2A1 artillery piece; the weapon is mounted on a carriage equipped with split box trails and pneumatic tires. On-carriage sighting and fire control equipment are used both for direct and indirect fire. The piece weighs 4,980 pounds, is 19.75 feet in length, has a muzzle velocity of 470 meters per second, and a maximum range of 11,155 meters. Maximum rate of fire is 4 rounds per minute.