210205-N-EJ843-0102 GROTON, Conn. (Feb. 05, 2021) Master-at Arms 1st Class Tristan Boris surrenders to Naval Submarine Base New London Security Forces during a simulated active shooter drill at the Submarine Force Library and Museum in support of Exercise Citadel Shield-Solid Curtain 2021 (CS-SC21). CS-SC21 is a two-part, force protection exercise that is being conducted nationwide on Navy installations. The annual exercise uses realistic scenarios to ensure Navy security forces maintain a high level of readiness to respond to changing and dynamic threats.

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