Defenders train during CRC
A defender from the 51st Security Forces Squadron responds to a simulated chemical attack during a Combat Readiness Course at Osan Air Base, Republic of Korea, Nov. 2, 2017. The simulated attacks are held on day nine of the 10 day course and are designed to make defenders utilize all the knowledge learned throughout the course. (U.S. Air Force photo by Senior Airman Gwendalyn Smith)

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Photo by: Senior Airman Gwendalyn Smith |  VIRIN: 171102-F-JW012-154.JPG