The prototype Avro <i>Vulcan</i> (s/n XV770) in flight. VX770 was delivered in August 1952. It was destroyed when it suffered a mid-air explosion on 20 September 1958.
USN
between 1952 and 1955 <div style="display: none;">date QS:P,+1952-00-00T00:00:00Z/8,P1319,+1952-00-00T00:00:00Z/9,P1326,+1955-00-00T00:00:00Z/9</div>
U.S. Navy Naval Aviation News July 1957 <a rel="nofollow" class="external autonumber" href="http://www.history.navy.mil/nan/backissues/1950s/1955/Jul57.pdf">[1]</a>, p. 21.