Gunnery Sgt. Min Soo Jung, a radio chief from 1st ROK

Gunnery Sgt. Min Soo Jung, a radio chief from 1st ROK Marine Division, does a radio check with a field radio and the secure communications controller as Marines look on in the combined operations center at Daegu Air Base in Daegu, Republic of Korea March 13. The Marines are with communications platoon, Headquarters Battalion, 3rd Marine Division, III Marine Expeditionary Force. MEFEX takes place at various training areas primarily throughout Southern and Southeastern Republic of Korea.