Description:U.S. and South Korean artillery troops conducted a joint live fire exercise on Tuesday (June 12) with a multiple launch rocket system, testing readiness against a potential artillery attack on the South. The military said each training event held in Cheorwon, 106 km (66 miles) north of Seoul, is unique in driving training proficiency. A U.S. artillery battalion and two South Korean artillery units participated in the drill.(0:48)