U.S. Army Spc. James Trest, a medic assigned to the

U.S. Army Spc. James Trest, a medic assigned to the 2nd Platoon, Alpha Company, 1st Battalion, 508th Parachute Infantry Regiment, 4th Brigade Combat Team, 82nd Airborne Division, detonates a mock improvised explosive device while guarding an airstrip during Joint Operational Access Exercise (JOAX) 13-02 Feb. 27, 2013, at the Sicily Drop Zone outside Fort Bragg, N.C. JOAX is designed to enhance cohesiveness between U.S. Army, Air Force and allied personnel, allowing the services an opportunity to properly execute large-scale heavy equipment and troop movement. (U.S. Air Force photo by Airman 1st Class Kyle Russell/Released)