Uzundzhovo Air Base used to house a fighter air regiment and after its disbandment became a squadron of the 19th Fighter Air Regiment. When the 19th FAR was transformed into 3rd FAB and shifted to ADC Uzundzhovo went along as an independent unit: the 4th Fighter Air Base. Shortly afterwards it changed tasks and hats transferring to the Tactical Air Command as 21st Fighter-Bomber Air Base and finally disbanded.