Second RF-4C built. It was converted on the McDonnell assembly line from a USN F4H-1 to a YRF-110A Spectre, later redesignated a RF-4C. Used for development testing of GE J79 engines. Transferred to Chanute AFB as a ground instructional airframe June 1978 and redesignated GRF-4C. Transferred to the Octave Chanute Museum in the early 1990s when the base closed. When the museum closed in 2015 it was transferred to the Regional Military Museum in Houma, LA. where it is on display.