The AQM-60 Kingfisher, originally designated XQ-5, was a target drone version of the USAF's X-7 ramjet test aircraft built by the Lockheed Corporation. The aircraft was designed by Kelly Johnson, who later created the Lockheed A-12 and its relatives, such as the Lockheed SR-71 Blackbird and Lockheed YF-12.^[1]

AQM-60 Kingfisher
AQM-60 Kingfisher awaiting loading onto its B-50 mothership before a test of US air defenses.
Role	Target drone
National origin	United States of America
Manufacturer	Lockheed
First flight	April 1951
Primary user	United States Air Force
Developed from	Lockheed X-7

The X-7's development began in 1946 after a request from the USAF for a Mach 3 unmanned aerial vehicle for test purposes. This craft evolved into the Kingfisher, which was later used to test anti-missile systems such as the MIM-3 Nike Ajax, SAM-A-25/MIM-14 Nike Hercules, and IM-99/CIM-10.^[2]

The Kingfisher was capable of evading the vast majority of weapons systems it was used to test, despite the systems being designed to destroy hypersonic missiles in flight. This created much embarrassment at the USAF and considerable political fallout. This led to the discontinuation of production in 1959 and the cancellation of the project in the mid-1960s.^[3]

The engine developed for the AQM-60 was later modified for use on the long range nuclear armed CIM-10 Bomarc, which was 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.^[4]