F-16 Fighting Falcons sit in a field along Miami St. at the 309th Aerospace Maintenance and Regeneration Group boneyard, Thursday, May 21, 2015 at Davis-Monthan Air Force Base in Tucson, Ariz. Over 4,500 variants of the F-16's have been produced since 1973. This field of fighters will become drone target planes in the future. (Photo by Matt York/AP Photo)
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