Recently I had a chance to visit the world famous Davis-Monthan air base in Tuscon, Arizona. This is the place where the United States stows the aircraft that are currently not needed by the services. At the moment the base contains approximately 4400 aircraft. part of the base is used to store flyable aircraft — i.e. aircraft that under deep conservation and will fly again, while the other part is full of aircraft being broken up for spare parts. This air base is the only military base that actually bring the profit to the us government — over $600 million per year (if one is to believe a tour guide). The planes on the base are kept as long as there are users for them anywhere in the world and there is demand for the spare parts. As soon as the last of the type is retied by the last military the planes are quickly scrapped or sent to the museums. Many long-lived aircraft like B-52 and B-1 are periodically cycled through the storage base in order to keep flying hour on all airframes more or less even and in case of a big war they can all be used
The tour is bus based and you are not allowed out of the bus.