91st SFG trains for Global Strike Challenge 17
Airman 1st Class Ryan Benjamin, 91st Missile Security Forces Squadron response force member, prepares for Global Strike Challenge training at Camp Grafton, N.D., May 4, 2017. Benjamin, also a 91st SFG Global Strike Challenge team member, used the gas mask to control breathing during the physical training. (U.S. Air Force photo/Senior Airman J.T. Armstrong)

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Photo by: Senior Airman J.T. Armstrong |  VIRIN: 170504-F-CG053-0064.JPG