180614-N-QY759-0043 SASEBO, Japan (June 14, 2018) Master-at-Arms Seaman Ryan Medill stands guard while Master-at-Arms 1st Class Jonathan Rosario as he checks a neutralized active shooter during an active shooter drill as part of exercise Citadel Pacific 2018 at Fleet Activities Sasebo, Japan. Citadel Pacific is designed to enhance training, readiness and capability of Navy security forces to respond to threats to Navy Installations and units. (U.S. Navy photo by Mass Communication Specialist 1st Class David R. Krigbaum/Released)