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OSAN AIR BASE, Republic of Korea (Mar. 19, 20150) - Republic of Korea (ROK) airmen perform a decontamination operation. ROK airmen participated in a chemical, biological, radiological and nuclear joint training exercise with Marine Wing Headquarters Squadron 1 CBRN and 51st Civil Engineer Squadron CBRN. The week-long bilateral training event enabled U.S. Marines and airmen, and ROK airmen to learn different tactics, techniques and procedures.