The Annual Desert Boneyard Run is held in the 309th Aerospace Maintenance and Regeneration Group (AMARG) "boneyard", a one-of-a-kind specialized airplane storage site on Davis-Monthan Air Force Base. The 309th AMARG provides depot-level maintenance, aircraft regeneration, storage and preservation, aircraft parts reclamation and disposal in support of the U.S. Department of Defense, allied warfighters and other government agencies. Runners have the rare chance to tread between the aircrafts that make up the largest air fleet in the world, other than the United States Air Force. The 2,600 acre site has nearly 4,000 aircraft and is typically only open to employees and the occasional bus tour. This unique event gives the general public an opportunity to see the boneyard's vast national treasures. 100% of the event proceeds go to a Morale, Welfare, and Recreation (MWR) fund that directly supports the military men and women on Davis-Monthan AFB and their families.