 By World War II, only the four 3-inch guns of Batteries Basinger and Smyth, plus a battery of anti-aircraft cannon, remained in service, and with the end of the war, the fort was declared surplus.In the 1950s, two buildings supporting the Nike missile system (since decommissioned) were built on the island, and a target tracking radar was constructed at the northwest end of the North Head, in one of the former gun positions of Battery Drum.In 1928, homeless men were housed in an addition to the former hotel, and in 1941 another addition housed a treatment center for alcoholics.