NORFOLK, Va. (Feb. 08, 2023) Sailors and civilians assigned to Naval Station Norfolk conduct an active shooter drill during Exercise Citadel Shield – Solid Curtain 2023, onboard NAVSTA Norfolk Feb. 08, 2023. Exercise Citadel Shield – Solid Curtain is an annual two-week long security training exercise that takes place on naval bases throughout the continental United States. (U.S. Navy photo by Mass Communication Specialist 2nd Class Emily Casavant)