Kammala jumla mai zuwa: Bayan kammala karatunsa daga Kwalejin Edwardes da ke Peshawar, ya shiga rundunar sojin sama ta Pakistan a shekarar 1956, inda ya fita a shekarar 1957 inda ya samu mukamin Jami'in Matukin Jirgin Sama. An ci gaba da horo a Amurka inda Jami'in Jirgin Sama ya cancanci tashi jirgin saman F-104 Starfighter kuma ya shiga cikin yaƙin na biyu da Indiya a 1965. Flight-Lieutenant Hakimullah, tare da saurin Mach 1.1, musamman ya tsayar da Folland Gnat na Sojojin Sama na Indiya wanda aka tuka ta sa'an nan-Flight lieutenant Brijpal Singh Sikand, wanda aka tilasta masa sauka kusa da filin jirgin sama a Pasrur, Pakistan. Amma, Indiya ta ƙaryata wannan da'awar. A shekara ta 1971, Wing-Commander Hakimullah ya tashi Mirage-IIIA a yammacin gaba na
yaki na uku tare da Indiya, ganin ayyukan iska a kan MiG-21.