180201-N-AM903-076 BETHESDA, Md. (Feb, 1, 2018) Sailors detain a gate runner during Citadel Shield 2018 at Naval Support Activity Bethesda in Bethesda, Md. The practice scenario was part of a series of exercises set up and played out over the course of the day to help participating personnel "train like we fight" in response to security threats. Citadel Shield-Solid Curtain are annual anti-terrorism force protection exercises held over two consecutive weeks. Each is designed to ensure peak readiness of personnel and security forces to deter and respond to potential security threats. (U.S. Navy photo by Mass Communication Specialist 3rd Class Julio Martinez Martinez/Released)