 This created a significant amount of embarrassment at the USAF, resulting in considerable political fallout, which led to the discontinuation of production in 1959 and the cancellation of the project entirely in the mid-1960s.The engine developed for the AQM-60 was later modified for use on the long range nuclear tipped CIM-10 Bomarc, which was used as a nationwide defense against nuclear bombers during the 1960s and early 1970s.An endurance variant of the same engine was produced for use in the Lockheed D-21, which was launched from the back of a Lockheed SR-71 Blackbird mothership or from under the wing of a Boeing B-52 Stratofortress nuclear bomber.