 The tactics needed for air defence tasks were obtained by the newly formed pilots and a required number of flight hours was achieved by them before transferring to a front-line squadron of the 1st or 2nd Air Defence Divisions.The same year 8 MiG-23MLAs were received by the 1st Squadron, this new variant being able to fire R-24 advanced BVR-missiles.At the end of 1991 the last MiG-23s being acquired by Bulgaria were delivered to Dobroslavtsi.