The 309th Aerospace Maintenance and Regeneration Group (AMARG), often called The Boneyard, is a United States Air Force aircraft and missile storage and maintenance facility in Tucson, Arizona, located on Davis-Monthan Air Force Base. AMARG was previously Aerospace Maintenance and Regeneration Center, AMARC, the Military Aircraft Storage and Disposal Center, MASDC, and started life after World War II as the 3040th Aircraft Storage Group.
AMARG takes care of more than 4,400 aircraft, which would make it the second largest air force in the world. An Air Force Materiel Command unit, the group is under the command of the 309th Maintenance Wing at Hill Air Force Base, Utah. AMARG was originally meant to store excess Department of Defense and Coast Guard aircraft, but has in recent years been designated the sole repository of out-of-service aircraft from all branches of the US government.
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AMARG was established in 1946 as the 4105th Army Air Force Unit to house B-29 and C-47 aircraft. Davis-Monthan Air Force Base was chosen because of Tucson's low humidity, infrequent rainfall, alkaline soil and high altitude of 2,550 feet (780 m), reducing rust and corrosion. The hard soil makes it possible to move aircraft around without having to pave the storage areas.
In 1948, after the Air Force's creation as a separate service, the unit was renamed the 3040th Aircraft Storage Depot. In 1965, the depot was renamed the Military Aircraft Storage and Disposition Center (MASDC), and tasked with processing aircraft for all the US armed forces (not just the Air Force). The U.S. Navy had operated its own boneyard at Naval Air Station Litchfield Park at Goodyear, Arizona for Navy, Marine and Coast Guard aircraft. In February 1965 some 500 aircraft were moved from Litchfield Park to Davis-Monthan AFB. NAS Litchfield Park was finally closed in 1968.
In the 1980s, the center began processing ICBMs for dismantling or reuse in satellite launches, and was renamed the Aerospace Maintenance and Regeneration Center (AMARC) to reflect the expanded focus on all aerospace assets. In the 1990s, in accordance with the START I treaty, the center was tasked with eliminating 365 B-52 bombers. The progress of this task was to be verified by Russia via satellite and first-person inspection at the facility. Initially, the B-52s were chopped into pieces with a 13,000-pound guillotine winched by a steel cable, supported by a crane. Later on, the tool of choice became K-12 rescue saws. This more precise technique afforded AMARG with salvageable spare parts.
In May 2007, command of AMARC was transferred to the 309th Maintenance Wing, and the center was renamed the 309th Aerospace Maintenance and Regeneration Group.