M2 mortar
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The M2 mortar is a 60 millimeter smoothbore, muzzle-loading, high-angle-of-fire weapon used by U.S. forces in World War II, the Korean War, and the Vietnam War for light infantry support. Wikipedia
Barrel length: 2 ft 5 in (726 mm)
Caliber: 60 mm (2.36 in)
Crew: 5 (squad leader, gunner, assistant gunner, two ammunition carriers)
Elevation: +40° to +85°
Maximum firing range: 1.1 mi (1.8 km)
Muzzle velocity: 520 ft/s (158 m/s)
Rate of fire: 18 rounds per minute