Oscar-Zero was one of 15 Missile Alert Facilities of the 321st Strategic Missile Wing of Grand Forks Air Force Base. About 60 feet below the facility was a steel-and-concrete Launch Control Center, where from 1966 to 1997 two Air Force missileers were always stationed, awaiting a presidential order to launch the 10 nuclear-tipped Minuteman missiles they controlled in 10 Launch Facilities located five to 15 miles away. During its 31 years of operation, Oscar-Zero also housed support personnel including security forces, a facility manager, and a chef. The security forces protected the Missile Alert Facility and its remote Launch Facilities, the facility manager oversaw enlisted personnel and site operations, and the chef provided four meals a day to assigned and visiting personnel. In 1991 the U.S. and the Soviet Union signed the Strategic Arms Reduction Treaty and agreed to eliminate some nuclear weapons. To meet treaty requirements, the U.S. deactivated the 321st Strategic Missile Wing, and the 150 Launch Facilities and 14 of the 15 Launch Control Centers were emptied and imploded. Oscar-Zero, with its underground Launch Control Center, and the topside of the November-33 Launch Facility were preserved for historical interpretation by the State Historical Society of North Dakota.