Pedzisa mutsara unotevera: Callinan akagadzwa somutevedzeri muCitizens Military Force muna June 1940, achisarudzwa kuva Royal Australian Engineers. Muna Kurume 1941, akazvipira kushanda mhiri kwemakungwa uye akabatana neChipiri cheAustralia Imperial Force, achitora chinzvimbo semurairidzi kuDemolitions Wing, pa7th Infantry Training Center. Akakwidziridzwa kuva kaputeni muna Chikunguru 1941, uye akazotumirwa semutevedzeri-mukuru ku &lt;a href="2/2nd%20Commando%20Squadron%20%28Australia%29"&gt;2/2nd Independent Company&lt;/a&gt;, achiendesa navo ku
Timor sorutivi rweSparrow Force muna December 1941. Iye gare gare akatungamirira macommando mukati mekurwisa kwavo pachitsuwa uye muna Chikunguru 1942 akasimudzirwa kwenguva pfupi kuva mukuru.