Developed from the XF-88 penetration fighter, the F-101 was first designed as a long-range bomber escort before being changed before production to serve both tactical and air defense roles. It made its first flight on September 29, 1954, and the first production F-101A became operational in May 1957. McDonnell Aircraft delivered 807 F-101s by the end of production in March 1961. The multi-mission F-101 served all three US Air Force commands—Tactical, Strategic, and Air Defense—and the Canadian Air Force. The Voodoo was the world's first supersonic photo-reconnaissance aircraft, was used during the Cuban Missile Crisis and in Southeast Asia during the late 1960s, and set major speed records in 1957 during Operation Firewall and Operation Sun Run. The F-101B was the only model to use J57-P-55 turbojet engines with substantially longer afterburners than the J57-P-13 engines. The last Voodoo retired in 1986. This JF-101B Voodoo, serial number 56-0250, is one of only two F-101Bs modified for special development tests and was last flown by the 4440th Aircraft Delivery Group at Langley AFB, Virginia.