US Navy (USN) MASTER-at-Arms (MA) SEAMAN (SN) Treva Christian, (foreground) and Sailors assigned to Shore Patrol at Naval Support Activity (NSA) Mid-South, Millington, Tennessee (TN), serve as the first line of security aboard the small naval base located just north of Memphis. The MASTER-at-Arms (MAA) force is responsible for the safety and security of the base personnel and property