NAS Patuxent River, Maryland and one squadron, AEW Squadron Eleven (VW-11), permanently based at Naval Station Argentia, Newfoundland. Their mission was to fly orbits to the Azores and back. An additional AEW training unit was based at NAS Patuxent River for training flight crews and maintenance personnel. BARLANT became operational on 1 July 1956, and flew continuous coverage until early 1965. The barrier was shifted to cover the approaches between Greenland, Iceland, and the United Kingdom (GIUK) barrier in June 1961. Aircraft from Argentia were staged through NAS Keflavik, Iceland, to extend coverage times. The Pacific Barrier (BARPAC) received the first operational AEW squadron, Airborne Early Warning Squadron One (VW-1) and the first EC-121K aircraft. AEW Squadron Three followed with AEW Squadrons Twelve, Fourteen, and Sixteen. In January 1958 VW-1 and VW-3 relocated to NAS Agana, Guam, M.I. where VW-1 continued its AEW commitments and VW-3 operational commitment was divided between AEW and weather. BARPAC became operational with AEW Squadron Twelve (VW-12) based at NAS Barbers Point, Hawaii, operating from a deployment base at NAS Midway on 1 July 1958 and later expanded to include AEW Squadrons Fourteen (VW-14) and Sixteen (VW-16). Their orbits overlapped the radar picket stations of the ships of Escort Squadron Seven, from roughly Adak Island to Midway. Normally, five WV-2s/EC-121s were required at any single time to provide coverage over the entire line. The Hawaiian barrier force operations were discontinued by September 1965, and their EC-121K aircraft were placed in storage. However, VW-1 continued operating until 1972, flying weather ops and supplying AEW to naval forces in the Gulf of Tonkin. USN C-121, EC-121, WC-12,1 and NC-121 operations continued until 1975 in seven other squadrons and until 1982 in an eighth. Some EC-121s were used in Vietnam, mirroring USAF EC-121 missions, but orbiting the Gulf of Tonkin, as that was the USN's assigned area. Fleet Air Reconnaissance Squadron One (VQ-1) and Fleet Air Reconnaissance Squadron Two (VQ-2) operated EC-121M ELINT gathering aircraft at NAF Atsugi, Japan, and Naval Station Rota, Spain, respectively, until they transitioned to the EP-3B Orion and EP-3E Aries aircraft. Weather Reconnaissance Squadron Four (VW-4) operated WV-3-cum-WC-121s between 1954 and 1975 as Hurricane Hunters, with its primary base at NAS Jacksonville, Florida, and a forward base at Naval Station Roosevelt Roads, Puerto Rico. Its Pacific counterpart, Weather Reconnaissance Squadron Three (VW-3) Typhoon Trackers was the operational weather squadron in the Pacific, flying