The F-94C was a new design originally called F-97. The F-94A and F-94B were a stretched out T-33. Congress cut off funding the the F-97 and since there was some money left in the F-94B project the F-97 was renumbered to F-94C and produced about 370.

My attraction to the "C" was I flew this model in USAF in 1956,57 and 58. At that time the F-94C, F-89 and F-86D were flown by most of the Air Defence squadrons in the US.