World War 2
Read this obituary for Sir Pat.
"Born in 1918, son of Alice and surgeon Arthur Eisdell Moore, Patrick Eisdell Moore grew up in Auckland, attended Auckland Grammar School and graduated in medicine from Otago University in 1941. He served in World War II as medical officer with the 28th NZ (Maori) Battalion, the only Pakeha in the Maori Battalion.
After the war, Sir Patrick travelled to England to obtain the Fellowship of the Royal College of Surgeons and gain practical experience in ENT surgery. He then returned to New Zealand and practised in Auckland until his retirement, pioneering community health initiatives, treatment of the deaf, cochlear implants and the establishment of Auckland's Hearing House." - Castle Publishing
NB: Sir Pat was not the only Pakeha in the Maori Battalion. Dr Cam D'Arcy, the RMO before him was Pakeha. Further, some officers and other men attached to the Maori Battalion such as Charles Bennet and Norm Perry were also Pakeha.