In 1935 he obtained his glider pilot license and began to study at the Volyn Cadet School for Artillery Reserve Officers (Wołyńska Szkoła Podchorążych Rezerwy Artylerii) in Włodzimierz Wołynski.

One year later he entered the Polish Air Force Academy in Dęblin.

In late October 1938 he was named second lieutenant (podporucznik) and assigned to the Polish 162nd Fighter Escadrille where he flew PZL P.7.

In France Główczyński was posted to the I/145 Polish Fighter Squadron where he flew a Caudron C.714.

On 17 August 1940, during a training flight his Hurricane caught fire for unknown reasons.

[6] In March 1944 he took a half-year study at Aviation School in Weston-super-Mare, then he served in the USAAF where he flew Republic P-47 Thunderbolt.