1, 1957, when a handful of rockets and 15 F-89 interceptors capable of carrying them were deployed at Wurtsmith Air Force Base in northern Michigan and Hamilton Air Force Base outside of San Francisco. By the next year, 268 F-89s had received the necessary wing pylon and fire-control system modifications to carry the weapon. While officially known as the MB-1 Genie, the rocket was often nicknamed "Ding-Dong" by crews and pilots. About 3,150 Genie rockets were produced before production ended in 1963. In 1962 the weapon was redesignated AIR-2A Genie. Many rounds were upgraded with improved, longer-duration rocket motors; the upgraded weapons sometimes known (apparently only semi-officially) as AIR-2B. An inert training round, originally MB-1-T and later ATR-2A, was also produced in small numbers - the training version was known to Canadian crews as the "dum-dum". A live Genie was detonated only once, in Operation Plumbbob on 19 July 1957. It was fired by USAF Captain Eric William Hutchison (pilot) and USAF Captain Alfred C. Barbee (radar operator) flying an F-89J over Yucca Flats. Sources vary as to the height of the blast, but it was between above mean sea level. A group of five USAF officers volunteered to stand uncovered in their light summer uniforms underneath the blast to prove that the weapon was safe for use over populated areas. They were photographed by Department of Defense photographer George Yoshitake who stood there with them. Gamma and neutron doses received by observers on the ground were negligible. Doses received by aircrew were highest for the fliers assigned to penetrate the airburst cloud ten minutes after explosion. While in service with the U.S. Air Force, the Genie was carried operationally on the F-89 Scorpion, F-101B Voodoo, and the F-106 Delta Dart. While the Genie was originally intended to be carried by the F-104 Starfighter using a unique 'trapeze' launching rail, the project never proceeded beyond the testing phase. Convair offered an upgrade of the F-102 Delta Dagger that would have been Genie-capable, but it too was not adopted. Operational use of the Genie was discontinued in 1988 with the retirement of the F-106 interceptor. The only other Genie user was Canada, whose CF-101 Voodoos carried Genies until 1984 via a dual-key arrangement where the missiles were kept under United States custody, and released to Canada under circumstances requiring their use. The RAF briefly considered the missile for use on the