As early as 1791, the spit of land at the confluence of the Anacostia and Potomac Rivers was set aside as a military reservation to guard the southern approaches to the new federal capital. Throughout its two-hundred-year history, the area has served as an arsenal, penitentiary, Artillery Post, U.S. Army Engineer School, Selective Service records repository, U.S. Army Band School, Military Police School, and is presently the home of the National Defense...