Deliveries of the RF-84F Thunderflash began in March 1954, with the 363rd Tactical Reconnaissance Wing being the first USAF recipient. The service life of the RF-84F with the 363rd was relatively short, and they were replaced by the McDonnell RF-101 Voodoo aircraft in 1957/1958. The first USAF Douglas RB-66B Destroyers were issued to the group's 9th Tactical Reconnaissance Squadron in January 1956. They replaced the obsolescent RB-26 Invader for night reconnaissance missions. Two more squadrons were equipped with RB-66Bs by the end of the year. The RB-66B very soon became the primary night photographic reconnaissance weapon system of the Tactical Air Command. In addition to the RB-66B, RB-66C models entered service with the 9th Squadron in February 1956. RB-66C models carried additional electronic countermeasures (ECM) equipment in wingtip pods. Chaff dispensing pods could be carried underneath the wing outboard of the engine nacelles. Later examples had the tail turret removed and replaced by additional ECM equipment installed in an extended tailcone. After the tail guns were removed, the gunner's position was usually left empty unless occupied by an instructor pilot or instructor navigator. In January 1953, the USAF asked McDonnell Aircraft to develop an unarmed photographic reconnaissance version of the F-101 Voodoo as a possible replacement for the Republic RF-84F Thunderflash. The first RF-101A was delivered to the 17th Tactical Reconnaissance Squadron on 6 May 1957 as a replacement for the subsonic RF-84F. The RF-101A had a redesigned and longer nose housing four cameras designed for low-altitude photography. In addition, two high-altitude cameras were mounted behind the cockpit in place of the ammunition boxes of the fighter variant. In September 1957, the RF-101C began deliveries to Shaw. The C model combined the strengthened structure of the F-101C with the camera installation of the RF-101A. In addition, the RF-101C differed from the RF-101A in being able to accommodate a centerline nuclear weapon, so that it could carry out a secondary nuclear strike mission if ever called upon to do so. The RF-101Cs served for a brief time alongside the RF-101A, but quickly replaced them by May 1958. On 8 February 1958, as part of the conversion of Tactical Air Command Wings to the dual deputy organizations, the 363rd Tactical Reconnaissance Group was inactivated and its personnel and equipment were assigned directly to the 363rd Wing, reporting to the wing's deputy commander for operations. Reactivation as a fighter unit The group was