. . . . . "38"^^ . "1971"^^ . "1969"^^ . . . . . . "High-altitude and high speed reconnaissance drone"@en . . . . . . . "Lockheed"@en . "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."@en . "United States"@en . . . . "Lockheed D-21"@en . . . . . . . . . . . . "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. An M-21 (specifically, a YF-12A Black Bird prototype) was used to transport a D-21 drone into Tselinoyarsk, during Operation Snake Eater in August 1964. The drone was used to insert Naked Snake into the area, due to heightened security. It was rigged to have its technologically-sensitive components self-destruct when the enemy was near in order to ensure the Soviets couldn't replicate the technology, although it was deliberately given U.S. markings to ensure that the Soviets knew of America's involvement, as part of negotiations with Nikita Khrushchev. Despite a successful landing, Snake felt that future designs of the D-21 pilot model should fix certain errors such as the landing buffer, as potential pilots could get killed using the drone in its current state. Ultimately, however, the project was cancelled in 1965 due to defense budget cuts made by then-Secretary of Defense Robert McNamara."@en . . "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."@en . "1964-12-22"^^ . . . . . "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. An M-21 (specifically, a YF-12A Black Bird prototype) was used to transport a D-21 drone into Tselinoyarsk, during Operation Snake Eater in August 1964. The drone was used to insert Naked Snake into the area, due to heightened security. It was rigged to have its technologically-sensitive components self-destruct when the enemy was near in order to ensure the Soviets couldn't replicate the technology, although it was deliberately given U.S. markings to ensure that the Soviets knew of America's involvement, as part of negotiations with Nikita Khrushchev. Despite a successful landing, Snake felt that"@en .