EVERETT, Wash. (Feb. 2, 2021) Sailors assigned to Naval Station Everett (NSE) simulate an active shooter situation in Exercise Citadel Shield-Solid Curtain 2021 (CS-SC 21), Feb. 2, 2021. CS-SC 21 is a U.S. Fleet Forces Command and Commander Navy Installations Command annual capstone antiterrorism exercise to practice and reinforce skills with base emergency services and local community partners who are tested on real-world emergencies. (U.S. Navy photo by Mass Communication Specialist 3rd Class Ethan Soto)