190205-N-HV059-1101 WILLIAMSBURG, Va. (Feb. 5, 2019) Members of the York-Poquoson Sheriff's Office coordinate with Naval Weapons Stations Yorktown and Cheatham Annex security forces in the mobile command center during an active shooter drill held as part of Citadel Shield/Solid Curtain (CS/SC) 2019. CS/SC is a two-part anti-terrorism force protection exercise that is being conducted nationwide on installations, Feb 4-15. The annual exercise is not in response to any specific threat, but is used to evaluate the readiness and effectiveness of fleet and installation security programs. (U.S. Navy photo by Mass Communication Specialist 2nd Class Sonja Wickard/Released)