5th SFS Defenders train for GS challenge
Airmen from the 5th Security Forces Squadron, ruck near the Air Traffic Control tower at Minot Air Force Base, N.D., March 16, 2017. The ruck was one of the many requirements for the Global Strike Challenge tryouts for the 5 SFS. (U.S. Air Force photo/Senior Airman Kristoffer Kaubisch)

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Photo by: Senior Airman Kristoffer Kaubisch  |  VIRIN: 170316-F-QP249-0131.JPG