U.S. Soldiers from 3rd Battalion, 509 Infantry (Airborne), 4th Brigade Combat Team, 25 Infantry Division, operate a 120-mm mortar system on Combat Outpost Zerok, Afghanistan, July 12, 2009. Some of the Soldiers are standing on the mortar's base plate in an effort to seat it securely to ensure accuracy during future fire missions. U.S. Army photo by SSgt. Andrew Smith/Released.