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.
The Multiple Launch Rocket System (MLRS) provides counter-fire and suppression of enemy air defences, light material and personnel targets at a range of 15 to 300 km (9 to 186 miles).
Last week, North Korea made threats to strike the headquarters of South Korean media, which it accused of hurling insults at the country's new leader, Kim Jong-un.
In May, the North stepped up its war of words against the United States, vowing to boost its nuclear deterrent after Washington warned Pyongyang of further sanctions if it did not abandon its atomic program.