By 1952, the Atomic Energy Commission had substantially increased both the quantity and variety of nuclear weapons, requiring Special Weapons Command to engage in R&D work and expand its test support activities. It was subsequently reduced to an operating agency level, losing its major command status, and was incorporated within the framework of the new Air Research and Development Command (ARDC), which had been established in September 1950 as a major command devoted to R&D. Kirtland AFB became an ARDC facility on 1 April 1952. SWC was re-designated the Air Force Special Weapons Center (AFSWC). Also at this time, the responsibility for biological and chemical research and testing—which had been established at Kirtland during the tenure of SWC—was transferred to Eglin AFB, Edwards AFB, and Holloman AFB. Kirtland then maintained an administrative role over those programs, presumably through the AFSWC.