The Aerospace Maintenance and Regeneration Group (AMARG) aka "The Boneyard" is located at Davis-Monthan AFB in Tucson, AZ. The Boneyard is an open-air, desert storage facility for retired military aircraft. Many of these aircraft are in a state of preservation and, therefore, available to be called back into service if needed. Certain airframes, such as the B-1 Lancer and A-10 Thunderbolt II, are being picked over for spare parts to support aircraft on active duty.