Tech Sgt. Hector Zamora, Air Force Reserve Command Defender Challenge team leader, performs 25 repetitions of lifting the ammo can as the first portion of his relay in the combat endurance event Sept. 13, 2018 at Camp Bullis Military Training Reservation, Texas. In this event, each team member completed a different callisthenic exercise, carried Jerry cans filled with water for 50 meters and then shot at a target with an M4 carbine rifle.