The 107th Mixed Aviation Regiment (Serbo-Croatian: 107. mešoviti avijacijski puk / 107. мешовити авијацијски пук) was an aviation regiment established in 1944 as 421st Assault Aviation Regiment (Serbo-Croatian: 421. vazduhoplovni jurišni puk / 421. ваздухопловни јуришни пук). History 421st Assault Aviation Regiment The 421st Assault Aviation Regiment was established on December 20, 1944, in Laćarak, from Yugoslav Partisan aviators serving with the Soviet Air Force 17th Air Army's 165th Guards Assault Aviation Regiment (165.GShAP). It became independent from Soviet command and personnel in May 1945, and became part of the 42nd Aviation Assault Division, equipped with Soviet Ilyushin Il-2 ground-attack aircraft. The regiment took part in the final operations of the liberation of Yugoslavia, during which time it was based at Laćarak, Krnješevci, Zemun, Nadalj, Bački Brestovac and Sombor airfields. After the war, the regiment was briefly stationed at Skopje before moving to Niš in late 1945. In 1948, the regiment was renamed in accordance with new Yugoslav Army conventions, and became the 107th Assault Aviation Regiment. The commanders of the regiment during this period were Dušan Božović and Dimitrije Kovačević, while the political commissar was Vinko Sever. 107th Regiment The 107th Assault Aviation Regiment remained at Niš for a short time, then in 1949 it was re-based at Leskovac, where it remained until 1953, when it returned to Niš. In 1953, the Soviet Ilyushin Il-2 attack aircraft were replaced with Yugoslav-made Ikarus S-49A fighter aircraft. The regiment was soon renamed the 107th Fighter Aviation Regiment (Serbo-Croatian: 107. lovački avijacijski puk / 107. ловачки авијацијски пук) and in 1957, it was reequipped with the American-built F-47D Thunderbolt. This resulted in yet another name change, when it became the 107th Fighter-Bomber Aviation Regiment (Serbo-Croatian: 107. lovačko-bombarderski avijacijski puk / 107. ловачко-бомбардерски авијацијски пук). The P-47 remained in service with the regiment until 1960. On August 18, 1960, the regiment was converted into the 107th Helicopter Regiment (Serbo-Croatian: 107. helikopterski puk / 107. хеликоптерски пук). It was equipped with Soviet-made Mil Mi-4 and British Westland S-55 helicopters. In 1961, with the "Drvar" re-organization of the Air Force, a new system was put in use to identify squadrons, and the three squadrons of the 107th Helicopter Regiment became the 780th, the 781st and the 782nd Transport Helicopter Squadron. In 1964, the 677th Transport Aviation Squadron was attached to the regiment, equipped with Douglas C-47 Skytrain and Lisunov Li-3 cargo aircraft. The following year,