5th SFS Defenders train for GS challenge
Airmen from the 5th Security Forces Squadron do sit ups as part of 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-QP249-0023.JPG