Marines of P Battery 5/14 use a ramming rod to push a 100-pound, high explosive projectile into the barrel of a M777A2 howitzer weapon system during a live-fire training exercise at the Yakima Training Center, Washington, Oct 14, 2017. In use by several armies by the mid-seventeenth century, the howitzer continues to be a staple of siege warfare to this day, allowing long-range, indirect fire on targets. (U.S. Air Force photo/Senior Airman Ryan Lackey)
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