Tuhia he tomokanga mō tēnei wāhanga - I whakawhiwhia a Callinan hei kaitiaki i roto i te Citizens Military Force i te Pipiri 1940, i whakaritea ki roto i nga Royal Engineers o Ahitereiria. I te Poutu-te-rangi 1941, i tono ia mo te mahi ki tawahi ka uru atu ki te Tuarua o te Mana o Ahitereiria, ka whakawhiwhia ki tetahi pou hei kaiwhakaako i te Whainga Whakakorenga, i te Whare Whakaakoranga 7 o te Infantry. I whakatairangahia ia ki te rangatira i te Hurae 1941, ana i muri mai ka tukuna hei tuarua ki te &lt;a href="2/2nd%20Commando%20Squadron%20%28Australia%29"&gt;2/2nd Kamupene Motuhake&lt;/a&gt;, i tohaina ki a raatau ki Timor
hei wāhanga o Sparrow Force i te Hakihea 1941. I muri mai ka arahi ia i nga commando i a raatau pakanga i te moutere a i te Hurae 1942 i whakatairangahia ia hei rangatira mo te wa poto.