Whakaotihia te rerenga e whai ake nei: I muri i tana haere ki te Whare Wananga o te Rangahau o Rashtriya (RIMC), i whakawhiwhia ia hei Midshipman i te Royal Indian Navy i te 1941 i te Tari Whakahaere. I uru ia ki te Pakanga Tuarua o te Ao hei rangatira i roto i te Royal Indian Navy mo te United Kingdom i te taha Pakeha, a i tukuna ia ki te haere ki te Britannia Royal Naval College i muri i te
te mutunga o te Pakanga Tuarua o te Ao i te tau 1945. Whai muri i tana tohu i te tohu kaimahi, ka hoki mai ia ki Ingarangi Ingarangi ka whakatairangahia hei Lieutenant i te Royal Indian Navy ka whakatau ia ki te kowhiri mo Pakistan i muri i te wehenga o Ingarangi Ingarangi, i taua tau ano. Ko Hassan tetahi o nga kaitohutohu moana tuatahi e rua tekau i whakatau ki te uru atu ki te Royal Pakistan Navy (RPN) hei Lieutenant me te Nama Ratonga PN.0073 i tuhia ki te raarangi pakeke i tukuna e te Royal Indian Navy ki te Manatū Tiaki o Pakistan. I kii ia he kaitakaro hokai pai ia i roto i te ope moana i reira i rangatira ai ia i te roopu hokai o te ope moana ki te roopu hokai a te Indian Navy; I wikitoria te roopu hokai a te RPN ma te taha e rima nga whaainga ki te whaainga kotahi i whakawhiwhia ki te roopu RIN.