OSAN AIR BASE, Republic of Korea --   Republic of Korea Army Soldiers Cpl. Jung Yoon Pil, Staff Sgt. Kim Hyung Seop, and Sgt. Lee Do Yoon, 51st Infantry Division Chemical, Biological, Radiological and Nuclear Support Unit members, respond to a CBRN threat during a combined forces training at Osan Air Base, ROK, Aug. 24, 2023. This training included U.S. Airmen, ROK Air Force and Army service members to ensure cohesiveness between bilateral components for mission readiness. (U.S. Air Force photo by Staff Sgt. Kelsea Caballero)