Sgt. Shamar Jackson, a cannoneer with Alpha Battery, 1st Battalion, 12th Marine Regiment, left, calls out repositioning coordinates for their M777 howitzer and the number of artillery shells to launch while Lance Cpl. Thi Nyugen, a cannoneer with Alpha Battery, 1st Bn., 12th Marines, writes down the fire mission during a training exercise at Schofield Barracks, June 11, 2013. Fire missions were sent from command stations behind the firing line, directing the individual teams on each gun coordinates for firing and how many rounds to send downrange. (U.S. Marine Corps photo by Lance Cpl. Matthew Bragg) - Sgt. Shamar Jackson, a cannoneer with Alpha Battery, 1st Battalion, 12th Marine Regiment, left, calls out repositioning coordinates for their M777 howitzer and the number of artillery shells to launch while Lance Cpl. Thi Nyugen, a cannoneer with Alpha Battery, 1st Bn., 12th Marines, writes down the fire mission during a training exercise at Schofield Barracks, June 11, 2013. Fire missions were sent from command stations behind the firing line, directing the individual teams on each gun coordinates for firing and how many rounds to send downrange. (U.S. Marine Corps photo by Lance Cpl. Matthew Bragg)