The 309th Aerospace Maintenance and Regeneration Group (309th AMARG), often called The Boneyard, is a United States Air Force aircraft and missile storage and maintenance facility in Tucson, Arizona, located at Davis–Monthan Air Force Base. Taking care of nearly 3,300 aircrafts, it is the largest plane storage and preservation facility in the world. The arid climate helps to store aircrafts, allowing to preserve them for years for remanufacturing or to be put back into service on the field all over the world.