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Because mortar rounds move at a lower rate than howitzer rounds, they require less propellant and generate less heat. This allows them to be fired more quickly. For instance, the M120 120mm mortar system can fire 16 rounds in its first minute and can sustain four rounds per minute. The M1911 howitzer can fire 12 rounds in two minutes and sustain three rounds per minute. (Photo: U.S. Army Spc. Patrick Kirby)
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