Military Working Dog Rex, of Naval Air Facility Atsugi Naval Security Force, lays on the deck of a MH-60S Seahawk helicopter during an aerial training exercise for K-9 units. NAF Atsugi’s MWDs are undergoing readiness training for future deployments through accumulation of scents, movement and the feel of riding in, and being around helicopters. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kegan E. Kay/Released)