High Quality Content by WIKIPEDIA articles! The term V bomber was used for the Royal Air Force (RAF) aircraft during the 1950s and 1960s that comprised the United Kingdom`s strategic nuclear strike force known officially as the V-force or Bomber Command Main Force. The bombers, whose names all started with the letter "V" and which were known collectively as the V-class, were the Vickers Valiant (first flew 1951, entered service 1955), Avro Vulcan (first flew 1952, in service 1956) and Handley Page Victor (first flew 1952, in service 1958). The V-Bomber force reached its peak in June 1964, with 50 Valiants, 70 Vulcans and 39 Victors in service.