Staff Sgt. Steven Staab, 51st Aerospace Medicine Squadron NCO in charge of radiation, tests a biological sample during Operational Readiness Exercise Beverly Midnight 15-1 March 4, 2015, at Osan Air Base, Republic of Korea. The test is down to determine if the air where the sample was taken is contaminated with biological agents. (U.S. Air Force photo by Senior Airman Matthew Lancaster)