Dee ihe ga-aga n'ihu na paragraf a - Mgbe Agha Ụwa nke Abụọ tiwapụrụ, McKinnon nọ n'England n'ọmụmụ ọzụzụ ndị agha. Ọ sonyeere Second New Zealand Expeditionary Force wee jee ozi na 3rd New Zealand Division n'oge mkpọsa na Solomon Islands
Ọ dị mma. Na mbido ọ bụ onye isi nke 28th Heavy Anti-Aircraft Regiment mana mgbe agbaghaara ya na July 1942 ọ weghaara 29th Light Anti-Aircraft Regiment. Ya na ndị agha ya rutere na Treasury na Green Islands. Mgbe e wepụrụ ngalaba ahụ na 1944, ọ laghachiri England ịga Staff College na Camberley. Mgbe ọ gụsịrị akwụkwọ ndị ọrụ ya, ọ sonyeere Ngalaba nke Abụọ nke New Zealand, n'oge ahụ na-alụ ọgụ na Italytali na Ndị Agha nke Asatọ, ya na ndị isi ndị agha ndị ọzọ jere ozi na Pacific. Mgbe ọ bịarutere Italy na February 1945, ọ bụ osote onye isi nke mbụ 4th Field Regiment na mgbe ahụ 6th Field Regiment.