VIRGINIA BEACH, Va. (Feb. 4, 2021) Master-At-Arms 1st Class Joshua Patton fires simulation rounds at U.S. Navy Security Forces during an entry control point (ECP) penetration drill at Joint Expeditionary Base Little Creek-Fort Story, Feb. 4, 2021, during Exercise Citadel Shield-Solid Curtain 2021. Citadel Shield-Solid Curtain is a two-part, anti-terrorism force protection exercise that is being conducted nationwide on Navy installations, Feb. 1-12. The annual exercise is not in response to any specific threat, but is used to evaluate the readiness of fleet installation security programs. (U.S. Navy photo by Engineman 3rd Class Zachary Teslovich)