A team of NAVAIR and Northrop Grumman specialists built three F-5F Franken-Tiger Adversary aircraft from parts of old U.S. Navy and Swiss F-5s. The Naval Air Station Key West needed more F-5s for its squadron, so rebuilding older F-5s that had very little service life left was the option. "We took the two-seat cockpit section and the tail section of the old Navy F-5Fs and bolted these on to the newer center section of the former Swiss F-5Es," said Jay Bolles, Adversary Aircraft program manager at NAVAIR.