 On 28 September 1991, in response to President Bush's directive to stand down the Minuteman II, personnel of the 351 OG began to dissipate launch codes and pin safety control switches at launch control centers.On 1 June 1992, the 351 OG was relieved of its emergency war order mission and its primary focus was deactivation of the Minuteman II weapon system.This day also marked the end of SAC and the beginning of Air Combat Command (ACC).