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- Lockheed_D-21 abstract "The Lockheed D-21 was an American Mach 3+ reconnaissance drone. The D-21 was initially designed to be launched from the back of its M-21 carrier aircraft, a variant of the Lockheed A-12 aircraft. Development began in October 1962. Originally known by the Lockheed designation Q-12, the drone was intended for reconnaissance missions deep in enemy airspace. The D-21 was designed to carry a single high-resolution photographic camera over a preprogrammed path, then release the camera module into the air for retrieval, after which the drone would self-destruct. Following a fatal accident when launched from an M-21, the D-21 was modified to be launched from a Boeing B-52 Stratofortress. Only four operational D-21 flights were made over the People's Republic of China before the program was canceled in 1971.".
- Lockheed_D-21 manufacturer Lockheed_Corporation.
- Lockheed_D-21 numberBuilt "38".
- Lockheed_D-21 thumbnail M-21_Rear.jpg?width=300.
- Lockheed_D-21 type Unmanned_aerial_vehicle.
- Lockheed_D-21 wikiPageExternalLink 1960.html.
- Lockheed_D-21 wikiPageExternalLink 04_Weapons_Precise_Destru.htm.
- Lockheed_D-21 wikiPageExternalLink D21-mach-3-supersonic-reconnaissance-plane-crashed-in-china.html.
- Lockheed_D-21 wikiPageExternalLink d-21.html.
- Lockheed_D-21 wikiPageExternalLink M21_Crash.htm.
- Lockheed_D-21 wikiPageID "776844".
- Lockheed_D-21 wikiPageRevisionID "580697316".
- Lockheed_D-21 firstFlight "1964-12-22".
- Lockheed_D-21 hasPhotoCollection Lockheed_D-21.
- Lockheed_D-21 introduced "1969".
- Lockheed_D-21 lists "* List of military aircraft of the United States * List of Lockheed aircraft".
- Lockheed_D-21 manufacturer Lockheed_Corporation.
- Lockheed_D-21 moreUsers United_States_Air_Force.
- Lockheed_D-21 nationalOrigin "United States".
- Lockheed_D-21 numberBuilt "38".
- Lockheed_D-21 primaryUser Central_Intelligence_Agency.
- Lockheed_D-21 related "* Lockheed A-12 * Lockheed YF-12 * Lockheed SR-71 Blackbird".
- Lockheed_D-21 retired "1971".
- Lockheed_D-21 type "High-altitude and high speed reconnaissance drone".
- Lockheed_D-21 subject Category:Black_projects.
- Lockheed_D-21 subject Category:Delta-wing_aircraft.
- Lockheed_D-21 subject Category:Lockheed_aircraft.
- Lockheed_D-21 subject Category:Parasite_aircraft.
- Lockheed_D-21 subject Category:Ramjet-powered_aircraft.
- Lockheed_D-21 subject Category:Single-engined_jet_aircraft.
- Lockheed_D-21 subject Category:Stealth_aircraft.
- Lockheed_D-21 subject Category:United_States_military_reconnaissance_aircraft_1960–1969.
- Lockheed_D-21 subject Category:Unmanned_military_aircraft_of_the_United_States.
- Lockheed_D-21 type Aircraft.
- Lockheed_D-21 type MeanOfTransportation.
- Lockheed_D-21 type Product.
- Lockheed_D-21 type DesignedArtifact.
- Lockheed_D-21 comment "The Lockheed D-21 was an American Mach 3+ reconnaissance drone. The D-21 was initially designed to be launched from the back of its M-21 carrier aircraft, a variant of the Lockheed A-12 aircraft. Development began in October 1962. Originally known by the Lockheed designation Q-12, the drone was intended for reconnaissance missions deep in enemy airspace.".
- Lockheed_D-21 label "D-21 (航空機)".
- Lockheed_D-21 label "D-21無人偵察機".
- Lockheed_D-21 label "Lockheed D-21".
- Lockheed_D-21 label "Lockheed D-21".
- Lockheed_D-21 label "Lockheed D-21".
- Lockheed_D-21 label "Lockheed D-21".
- Lockheed_D-21 label "Lockheed D-21".
- Lockheed_D-21 label "Lockheed D-21/M-21".
- Lockheed_D-21 label "Lockheed D-21/M-21".
- Lockheed_D-21 sameAs Lockheed_D-21.
- Lockheed_D-21 sameAs M-21.
- Lockheed_D-21 sameAs Lockheed_D-21.
- Lockheed_D-21 sameAs Lockheed_D-21.
- Lockheed_D-21 sameAs M-21.
- Lockheed_D-21 sameAs D-21_(航空機).
- Lockheed_D-21 sameAs Lockheed_D-21.
- Lockheed_D-21 sameAs m.03blhc.
- Lockheed_D-21 sameAs Q2454458.
- Lockheed_D-21 sameAs Q2454458.
- Lockheed_D-21 wasDerivedFrom Lockheed_D-21?oldid=580697316.
- Lockheed_D-21 depiction M-21_Rear.jpg.
- Lockheed_D-21 isPrimaryTopicOf Lockheed_D-21.