Tactical reconnaissance aircraft for the USAF, based on the F-4C airframe. Initially designated RF-110 Spectre. A total of 503 aircraft were delivered with J79-GE-15 engines, IRLS (AN/AAS-18A), SLAR (Loral(Goodyear) AN/APQ-102 or AN/UPD-4), AN/ALQ-99 radar (as in RF-4B) and Litton AN/ALQ-125 Tactical Electronic Reconnaissance-suite. Initially, the RF-4C carried no weapons, and the underfuselage Sparrow missile slots of the F-4C were omitted. However, in an emergency the RF-4C could carry a nuclear weapon on the centerline position, but this was rarely done in practice. Aircraft from the European-based 10th TRW were eventually fitted with AN/AJB-7 Low Altitude Bombing System (as in the F-4C) just in case the delivery of nuclear weapons ever became necessary. In later years, RF-4Cs were armed with AIM-9 Sidewinder missiles carried on the inner underwing pylon for self-defense.

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