 When Romania and the Soviet Union entered Slovakia, with some captured aircraft and defectors they organized a local Insurgent Air Force to continue the fight against Axis forces in country.Others served voluntarily in "Luftwaffe" units; later these air units were integrated to the reconstituted Czechoslovak Air Force after the end of the war.These were primarily assigned to Letecky Pluk (Air Regiment) 3 and numbered 79 Avia B-534 and 11 Bk-534 biplane fighters, 73 Letov S-328 biplane observation, and 15 Aero A-100 and Ab-101 biplane reconnaissance aircraft plus a miscellany of trainers and other minor types.