Lockheed A-12

The Lockheed A-12 was a reconnaissance aircraft built for the Central Intelligence Agency (CIA) by Lockheed's Skunk Works, based on the designs of Clarence "Kelly" Johnson. The aircraft was designated A-12, the 12th in a series of internal design efforts with the A referring to "Archangel", the internal code name of the aircraft. It competed in the CIA's Oxcart program against the Convair Kingfish proposal in 1959, and won for a variety of reasons.

The A-12's specifications were slightly better than those of the Kingfish, and its projected cost was significantly less. Convair's design had a smaller radar cross-section, however, and CIA's representatives initially favored it for that reason. The companies' respective track records proved decisive. Convair's work on the B-58 had been plagued with delays and cost overruns, whereas Lockheed had produced the U-2 on time and under budget. In addition, it had experience running a “black” project.

The A-12 was produced from 1962 to 1964, and was in operation from 1963 until 1968. It was the precursor to the twin-seat U.S. Air Force YF-12 prototype interceptor, M-21 drone launcher, and the famous SR-71 Blackbird, a slightly longer variation able to carry a heavier fuel and camera load. The A-12's final mission was flown in May 1968, and the program and aircraft retired in June of that year. The program was officially revealed in the mid-1990s.

M21

M21 or M-21 may refer to:

Transportation

Military

Other

M-21 (Michigan highway)

M-21 is an east–west state trunkline highway in the US state of Michigan connecting the cities of Grand Rapids and Flint. The highway passes through rural farming country and several small towns along its course through the Lower Peninsula. Following the course of a handful of rivers, M-21 also connects some of the state's freeways like Interstate 96 (I-96), US Highway 127 (US 127) and I-75. The highway is used by between 1,700 and 36,000 vehicles daily.

M-21 was designated along the highway by July 1, 1919 between Ionia and Goodells near Port Huron. Changes made in the 1920s extended it on the west end to Holland and on the east end to Port Huron. M-21 was truncated at both of its current termini as two Interstate freeways were completed. I-196 functionally replaced M-21 between Holland and Grand Rapids with a portion retained under state maintenance as Old M-21, now M-121. I-69 replaced M-21 from Flint to Port Huron. A section of M-21 through Flint became M-56. That designation was decommissioned in the 1980s when M-21 was returned to its former routing in Flint.