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M109 howitzer

The M109 is an American 155 mm turreted self-propelled howitzer, first introduced in the early 1960s to replace the M44. It has been upgraded a number of times, most recently to the M109A7. Wikipedia
Armor: Aluminum alloy
Breech: interrupted screw
Crew: 6 (commander, driver, gunner, 3 loaders); M109A6–A7: 4 (commander, driver, gunner, loader)
Designed: 1952–1962
Height: 10 ft 8 in (3.25 m)
In service: M109: 1963–present; M109A1: 1973–present; M109A2: 1979–present; M109A6: 1994–present; M109A7: 2015–present
Maximum speed: 35 mph (56 km/h); M109A7: 38 mph (61 km/h)