5th SFS Defenders train for GS challenge
Airman 1st Class Bryan Butler, 5th Security Forces Squadron defender, fills out a form for Global Strike Challenge tryouts at Minot Air Force Base, N.D., March 16, 2017. The tryouts pushed the defenders to their physical limits with a ruck in full gear, push-ups, pull-ups, sit-ups, buddy runs, room clearing and weapons firing. (U.S. Air Force photo/Senior Airman Kristoffer Kaubisch)

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Photo by: Senior Airman Kristoffer Kaubisch  |  VIRIN: 170316-F-QP249-0001.JPG