190206-N-VD165-072 FORT WORTH, Texas (Feb. 6, 2019) Master-at-Arms 2nd Class Misty Chapa, assigned to Naval Air Station Fort Worth Joint Reserve Base security forces, assesses Master-at-Arms Seaman Mack Mobley during an active shooter drill as part of exercise Citadel Shield/Solid Curtain. The anti-terrorism and force protection exercise is conducted by Navy installations within the continental United States to ensure that the Navy is ready to respond to changing and dynamic threats at all times. (U.S. Navy photo by Mass Communication Specialist 1st Class Jose R. Jaen/Released)