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YEONCHEON, South Korea (May 10, 2016) - Lt. Col. Douglas Hayes, commander, 1st Battalion, 82nd Field Artillery Regiment, 1st Armored Brigade Combat Team, 1st Cavalry Division, and Republic of Korea Army Col. Seong Ik Sung, commander, 26th Mechanized Infantry Division Artillery, discuss the progress of a coordinated, joint artillery exercise. The exercise, less than six miles from the Demilitarized Zone that separates North and South Korea, involved 30 self-propelled artillery from the U.S. and South Korea.