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Competitors from the 8th Security Forces Squadron take off their gas masks before moving onto the next leg of the Defenders Challenge held Sept. 28, 2012, at Kunsan Air Base, Republic of Korea. As part of the challenge, competitors donned their gas masks and sprint around a field before assembling an M4 carbine and function-checking an M9 handgun. (U.S. Air Force photo/Senior Airman Brigitte N. Brantley)


Gas masks

Competitors from the 8th Security Forces Squadron take off their gas masks before moving onto the next leg of the Defenders Challenge held Sept. 28, 2012, at Kunsan Air Base, Republic of Korea. As part of the challenge, competitors donned their gas masks and sprint around a field before assembling an M4 carbine and function-checking an M9 handgun. (U.S. Air Force photo/Senior Airman Brigitte N. Brantley)

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