 From 1963 to 1970, the Navy's Joint Task force 8 and the Atomic Energy Commission (AEC) held joint operational control of the island during high-altitude nuclear testing operations.In 1970, operational control was handed back to the Air Force until July 1973, when Defense Special Weapons Agency was given host-management responsibility by the Secretary of Defense.Over the years, sequential descendant organizations have been the Defense Atomic Support Agency (DASA) from 1959 to 1971, the Defense Nuclear Agency (DNA) from 1971 to 1996, and the Defense Special Weapons Agency (DSWA) from 1996 to 1998.