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81st SFS hosts Defender's Challenge Ruck

Members of the 81st Security Forces Squadron participate in the ammo carry portion of the 81st SFS 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)

Members of the 81st Security Forces Squadron participate in the ammo carry portion of the 81st SFS 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)

Members of the Keesler Marine Detachment team participate in the air squats portion of the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

Members of the Keesler Marine Detachment team participate in the air squats portion of the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

Members of the Keesler Marine Detachment team participate in the pull-up portion of the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

Members of the Keesler Marine Detachment team participate in the pull-up portion of the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

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)

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)

Ruck sacks are displayed on the ground during the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

Ruck sacks are displayed on the ground during the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

Members of the 333rd Training Squadron team participate in the jump squats portion of the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

Members of the 333rd Training Squadron team participate in the jump squats portion of the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

U.S. Air Force 2nd Lt. Brian Lee, 333rd Training Squadron student, completes a pull-up during the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

U.S. Air Force 2nd Lt. Brian Lee, 333rd Training Squadron student, completes a pull-up during the 81st Security Forces Squadron Defender's Challenge Ruck near 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)

U.S. Air Force Staff Sgt. Jesse Daniel, 81st Security Forces Squadron confinement NCO in charge, and Staff Sgt. Tradarius Christian, 81st SFS police services, lead their team in running a lap while carrying ruck sacks during the 81st SFS 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)

U.S. Air Force Staff Sgt. Jesse Daniel, 81st Security Forces Squadron confinement NCO in charge, and Staff Sgt. Tradarius Christian, 81st SFS police services, lead their team in running a lap while carrying ruck sacks during the 81st SFS 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)

U.S. Air Force Staff Sgt. Thane Sandy, 81st Security Forces Squadron combat arms instructor, flips a tire during the 81st SFS 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)

U.S. Air Force Staff Sgt. Thane Sandy, 81st Security Forces Squadron combat arms instructor, flips a tire during the 81st SFS 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)

KEESLER AIR FORCE BASE, Miss. --