A rare Phantom, assigned to the 4485th Test Squadron of the USAF Air Warfare Center at Eglin AFB (FL). The 4485th operated several Phantom types at that time, F-4Ds, F-4Es, RF-4C and F-4Gs. The latter and so the one on the picture belonged to 4485th TS/Det.5, which was based at George AFB (CA). These birds initially carried the 35th TFW code of 'WW' before switching to 'OT'. During the switch, the birds received a gray checkered pattern on the fin cap, representing a toned-down version of the black and white checkers.