WASHINGTON (Feb. 9 , 2023) Cpl. Mike Jacobs, an officer assigned to the Naval District Washington Police Department, scans a hallway for threats during an active shooter drill on board the Washington Navy Yard. The drill was conducted as part of Citadel Shield/Solid Curtain 2023, a yearly, two-part anti-terrorism and force protection exercise designed to test the effectiveness of the installations readiness and training programs. (U.S. Navy Photo by Mass Communication Specialist 2nd Class Griffin Kersting)