81st SFS hosts Defender's Challenge Ruck
U.S. Marine Staff Sgt. Brandon Mersereau, Keesler Marine Detachment instructor, watches as members of the Keesler MARDET team participate in the tire flipping portion of the 81st Security Forces Squadron Defender's Challenge Ruck on the Crotwell Track on Keesler Air Force Base, Mississippi, Aug. 16, 2019. The competition, consisting of 11 four-person teams, completing seven obstacles, was one of several events in recognition of The Year of the Defender. (U.S. Air Force photo by Kemberly Groue)