Master-at-Arms 2nd Class Shane McClennen and Master-at-Arms 2nd Class Will Casselle, both with Naval Station Norfolk Security Military Working Dogs Unit, prepare to search vehicles for improvised explosive devices during Exercise Citadel Shield at Naval Station Norfolk. This annual exercise is designed to enhance the training and readiness of Navy Security Forces to respond to threats to installations and units. (U.S. Navy photo by Mass Communication Specialist 2nd Class Scott Pittman/Released)