Lockheed took over the Marietta plant in 1951 after its wartime Bell B-29 production period and built the site into a large transport-aircraft manufacturing base. New Georgia Encyclopedia describes the C-130 contract as the point at which the facility became more than a branch assembly plant, and says Lockheed reorganized the Georgia division as Lockheed-Georgia Company as engineering and program responsibility grew around the C-141 Starlifter.
The company's most visible catalog connection is the C-5 Galaxy. Lockheed Martin says every production C-5 was built at Marietta, with C-5A aircraft produced from 1968 to 1975 and C-5B aircraft from 1985 to 1989. The same site later supported C-5M modernization work, while the current Lockheed Martin Marietta operation continues aircraft production, sustainment, and supply-chain work for U.S. and allied customers.
military transport aircraftstrategic airlifterstactical airliftersaircraft production and sustainment
Lockheed-Georgia Co. was the historical Marietta Lockheed organization rather than a current standalone company. Current official web links point to Lockheed Martin successor pages for the Marietta site and C-5 program.