 All F-15 aircraft were grounded by the USAF after a Missouri Air National Guard F-15C came apart in flight and crashed on 2 November 2007.The newer F-15E fleet was later cleared for continued operations.The US Air Force reported on 28 November 2007 that a critical location in the upper longerons on the F-15C model was suspected of causing the failure, causing the fuselage forward of the air intakes, including the cockpit and radome, to separate from the airframe.