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South Korean Soldiers use flags, in addition to other methods, to precisely time artillery strikes, during a joint U.S. and South Korean artillery exercise May 10. U.S. Army Soldiers from the 1st Battalion, 82nd Field Artillery Regiment, 1st Armored Brigade Combat Team, 1st Cavalry Division, conducted the exercise with South Korean batteries from the 26th Mechanized Infantry Division Artillery. (U.S. Army photo by Staff Sgt. Keith Anderson, 1st Armored Brigade Combat Team Public Affairs, 1st Cav. Div.)