Jämtland Wing (), also F 4 Frösön, or simply F 4, is a former Swedish Air Force wing with the main base located at Åre Östersund Airport outside Östersund on Frösön in the middle of Sweden. History The airbase was set up in 1926 as the 4th Air Corps at the old base of Jämtland Ranger Regiment at Frösö läger (Frösö camp). The main task was to perform reconnaissance for army units. In 1930, the duties were extended to bombing with B 4 and later B 5 planes. In 1936, the Flying Corps was reorganized as an own branch (the Air Force) and the unit was renamed Jämtlands Flygflottilj (Jämtland Wing). In 1947, the wing was yet again redesigned as a fighter wing and received surplus P-51 Mustangs designated as J 26. These were only kept for five years until they were replaced by J 28A jets in 1952. Again, after only four years, they were in turn replaced by J 29A in 1956. In 1967, the J 32B entered service at the wing only to be replaced again in 1969 by J 35D. These served until 1984 when the Saab 37 Viggen was introduced as served the wing for 20 years. Swedish Prime Minister Stefan Löfven famously served as a Munitions Systems specialist Conscript with the F 4 Wing for the duration of his 1-year compulsory military service in 1976-77. The JAS 39 Gripen served briefly for only a year as a replacement for the Viggens until the wing was decommissioned in 2005. The airfield is known today as Åre Östersund Airport . Barracks and training areas In the rangers' old camp below Frösö Church on Frösön outside Östersund. The wing had a runway in the north-west-southeast direction. Heraldry and traditions Coat of arms The first coat of arms of the Jämtland Wing was used from 1944 to 1994. Blazon: "Azure, the provincial badge of Jämtland, an elk passant argent, attacked on the back by a rising falcon and in the front by a rampant dog both or; all animals armed and langued gules." The second coat of arms was used from 1994 to 2004. Blazon: "Azure, the provincial badge of Jämtland, an elk passant argent, attacked on the back by a rising falcon and in the front by a rampant dog both or; all animals armed and langued gules, a chief azure over a string or, charged with