Orders were placed totaling 142 PO-2W Constellations based on the Lockheed L-1049 Super Constellation with deliveries beginning in 1953. The PO-2W was redesignated WV-2 in 1954. In 1962, with standardization of aircraft designations within the Department of Defense, the WV-2 then became the EC-121K. A total of 13 of these were converted to WV-2Q "Electronic Intelligence" (ELINT) aircraft (becoming EC-121M in 1962). 9 were converted to WV-3 weather reconnaissance aircraft (WC-121N in 1962). The EC-121K was also operated by Training Squadron 86 (VT-86) at NAS Glynco, Georgia for training of Student Naval Flight Officers destined to fly both the EC-121 and the Grumman E-2 Hawkeye. At NAS Glynco closure VT-86 transferred to NAS Pensacola, Florida in 1973, the squadron's last EC-121 was also flown to NAS Pensacola being stored in the collection of the National Museum of Naval Aviation where it still remains. A single aircraft became an NC-121K, the electronic warfare variant assigned to Tactical Electronic Warfare Squadron 33 (VAQ-33) at NAS Key West, Florida. The aircraft was the last EC-121 in operational service, flying until 25 June 1982.