 Ramba uchiverenga ndima iyi - Dunne akatanga basa rake rechiuto muTerritoir Force yeNew Zealand Army muna 1971. Akachinjirwa kuRegular Force muna Gumiguru 1977 aine chinzvimbo chemutevedzeri, muRoyal New Zealand Infantry Regiment. Akagoverwa ku1 Ranger Squadron, New Zealand Special Air Service, Papakura, uye akashandiswa semutungamiriri wemauto. Somutungamiriri, akaendeswa mhiri kwemakungwa neNew Zealand Army Truce Monitoring Contingent muSouth Rhodesia. Muna Chikunguru 1989, Dunne akagadzwa kuva mutungamiri weChikoro cheOfficer Cadet muWaiouru uye akasimudzirwa kuva lieutenant colonel. Muna September 1999 akaendeswa kuNew Zealand Force East Timor semukuru mukuru wenyika. Akakwidziridzwa kuva brigadier muna Gumiguru 1999 uye akatungamira Dili Command, mubato unoshanda muInternational Force East Timor.INTERFET. Muchiitiko ichocho muEast Timor, Dunne akatungamira maNew Zealand Forces nemauto epasi rose panguva yekuendeswa kukuru kweNew Zealand kubvira Hondo Yenyika II. Akakwidziridzwa pachinzvimbo chegeneral mukuru musi wa2 Kubvumbi 2001 asati atora kugadzwa kwake saCommander Joint Forces New Zealand COMJFNZ, chinzvimbo chaakabata kusvika 2004. 