190205-N-CC785-087 GREAT LAKES, Ill. (Feb. 5, 2019)Naval Station Great Lakes security forces subdue and search a suspect during an active shooter scenario at Fisher Medical Branch clinic during the Citadel Shield/Solid Curtain (CS/SC) 2019 exercise. Exercise Solid Curtain-Citadel Shield (CS/SC) 2019 is a two-part anti-terrorism 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 evaluated the readiness and effectiveness of fleet and installation security programs. (U.S. Navy photo by John Sheppard/Released)