180202-N-RN782-0005 MILLINGTON, Tenn. (Feb. 02, 2018) Naval security forces respond to a reported active shooter during a security exercise at Naval Support Activity (NSA) Mid-South. A part of the Navy Region Southeast and Navy Installations Command, NSA Mid-South is currently participating in exercise Solid Curtain-Citadel Shield 2018 which is designed to test different regional anti-terrorism force protection operations. (U.S. Navy photo by Mass Communication Specialist 2nd Class Brian Glunt/Released)