A small air arm was organised along Soviet lines during 1947. Following the communist takeover, Russian military aid was stepped up and a major expansion program initiated. By 1956 the Hungarian Air Force consisted of the 25th Fighter Division ("25. Vadászrepülő Hadosztály", HQ in Taszár), the 66th Fighter Division ("66. Vadaszrepülő Hadosztály", HQ in Kecskemét), the 82nd Separate Bomber Division ("82." "Önálló Bombázó Hadosztály", HQ in Kunmadaras), the 28th Ground Attack Division ("28. Csatarepülő Hadosztály," HQ in Székesfehérvár) and a training air division. When Soviet forces invaded to suppress the Hungarian Revolution of 1956, sections of the Hungarian Air Force attacked Soviet forces and resisted Russian attempts to occupy their bases. The resistance was short-lived and the entire Hungarian air force was demobilized soon after. A reconstituted air arm was reformed in the following year as part of the Hungarian People's Army, but initially only as an internal security force. The remaining Hungarian air force assets were organised in the Aircraft Training Center ("Repülő Kiképző Központ" ("RKK")) on April 1, 1957, with one mixed aircraft types squadron each at the main fighter air bases at Pápa, Taszár and Kecskemét. Gradually, starting in 1959 as Hungary became stable, the air force was expanded again, but it remained an integral part of the army and was essentially a defensive force.