Dee ihe na-aga n'ihu maka paragraf a - Simpson nọ na battalion nke abụọ, Royal Australian Regiment na Jenụwarị 1954, ebe e buliri ya n'ọkwa sergeant na 1955, na-eje ozi na Malaya
site na October 1955 ruo afọ abụọ sochirinụ. E mechara ziga ya na 1st Special Air Service Company (SAS) na Nọvemba 1957 wee jee ozi na ngalaba ahụ ruo mgbe ahọpụtara ya dị ka otu n'ime ndị otu mbụ nke ndị otu ọzụzụ ndị agha Australia na Vietnam (AATTV) zigara iji nyere ndị agha South Vietnam aka na July 1962. Mgbe otu afọ gachara, ọ laghachiri SAS na Australia wee jee ozi ebe ahụ ọnwa iri na abụọ sochirinụ.