 Complete the following phrase:  The refuge was established in 1984; much of its land was previously part of Fort John Custis later Cape Charles Air Force Station, a base used by the United States Army 19411948 and the United States Air Force from 1948 until 1981. Gun batteries remain from the Army period and several buildings remain from the Air Force period. A a href1626quot3B5020caliber20Mark20720gun1650 caliber Mark 7 guna and a projectile from an have been placed at Battery Winslow, formerly part of Fort John Custis. Also near the refuge is Fisherman Island, classed as a 