MINOT AIR FORCE BASE, N.D. -- The 5th Security Forces Squadron held a Defender Challenge at Minot Air Force Base, North Dakota, April 21, 2018. During the challenge, Airmen competed against each other in an M4 carbine and Beretta M9 pistol competition, combatives and a 1.5-mile run. Two elements from each shift in the operations section competed for a trophy. (U.S. Air Force photos by Airman 1st Class Alyssa M. Akers)