Michael Walter Wynne (born September 4, 1944) is an American politician and business executive and was the 21st United States Secretary of the Air Force. Secretary of Defense Robert Gates asked for and received his resignation (and that of Chief of Staff T. Michael Moseley) on June 5, 2008, in the wake of the 2007 United States Air Force nuclear weapons incident and the mistaken shipment of Minuteman III parts to Taiwan in 2006, followed by an investigation by and a critical report from Admiral Kirkland H. Donald regarding the Minuteman incident. Michael B. Donley, Department of Defense Director of Administration and Management, was nominated to replace Wynne by President George W. Bush on June 9, 2008.