M116 howitzer
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The 75mm Pack Howitzer M1 was a pack howitzer artillery piece used by the United States. Designed to be moved across difficult terrain, gun and carriage could be broken down into several pieces to be carried by pack animals. Wikipedia
Shell: Fixed and Semi-fixed; 75 x 272 mm R
Breech: Horizontal-block
Caliber: 75 mm (2.95 in)
Carriage: Box trail or Split-trail depending on model
Effective firing range: 8.8 km (5.5 mi)
Elevation: -5° to +45°
In service: 1927–present