On 29 August 2007, six AGM-129 ACM cruise missiles, each loaded with a W80-1 variable yield nuclear warhead, were mistakenly loaded onto a United States Air Force (USAF) B-52H heavy bomber at Minot Air Force Base in North Dakota and transported to Barksdale Air Force Base in Louisiana. The nuclear warheads in the missiles were supposed to have been removed before the missiles were taken from their storage bunker. The missiles with the nuclear warheads were not reported missing, and remained mounted to the aircraft at both Minot and Barksdale for 36 hours. During this period, the warheads were not protected by the various mandatory security precautions for nuclear weapons.The incident was reported to the top levels of the United States military and referred to by observers as a Bent Spear incident, which indicates "an unexpected occurrence involving nuclear weapons or nuclear components that does not fall under the NUCFLASH or BROKEN ARROW categories" or "a nuclear incident involving a nuclear weapon/warhead or nuclear component". In the Army and Air Force, this term includes a 'significant incident' as defined in DoD Directive 5100.52".In response to the incident, the United States Department of Defense (DoD) and USAF conducted an investigation, the results of which were released on 19 October 2007. The investigation concluded that nuclear weapons handling standards and procedures had not been followed by numerous USAF personnel involved in the incident. As a result, four USAF commanders were relieved of their commands, numerous other USAF personnel were disciplined or decertified to perform certain types of sensitive duties, and further cruise missile transport missions from—and nuclear weapons operations at—Minot Air Force Base were suspended. In addition, the USAF issued new nuclear weapons handling instructions and procedures.
Source: https://en.wikipedia.org/wiki/2007_United_States_Air_Force_nuclear_weapons_incident
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