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​​Radar images

    The 309th Aerospace Maintenance and Regeneration Group (AMARG) is an enormous facility located at Davis-Monthan Air Force Base in Tucson, Arizona and is a part of Air Force Material Command (AFMC). The purpose of this facility, often called the Boneyard, is to store aircraft that have started to show wear and tear, and can no longer perform the duties they were designed to do. However, not all the aircraft in the Boneyard are completely useless. Many aircraft provide parts for other aircraft of the same type that are still on active duty in order to keep the fleet ready for action. The 309th AMARG organizes the aircraft into four different categories: Type 1000, Type 2000, Type 3000, and Type 4000. Type 1000 is reserved for aircraft that are kept in a somewhat flyable condition, so that if need be, they can be returned to service with only a few modifications that will restore it to a front line fighter. On February 13, 2015, a B-52H (61-0007, nicknamed "Ghost Rider") was flown from Davis-Monthan to Barksdale AFB to replace a B-52 that was damaged beyond repair in a cockpit fire caused by an oxygen leak. Type 2000 is for parts reclamation,  Type 3000 keeps aircraft in a flyable condition for a short amount of time after they arrive until they get a new destination with a new unit or owner, and Type 4000 is for aircraft awaiting disposal. As of July 2015, there were approximately 3900 aircraft sitting in the Boneyard. 

Boneyard (July 2015)