<prompt> Callinan o ile a kgethwa bjalo ka lefotenente go Citizens Military Force ka June 1940, a kgethwa go ba Royal Australian Engineers. Ka March 1941, o ile a ithaopela go ya go hlankela dinageng dišele gomme a tsenela Sešole sa Bobedi sa Mmušo wa Australia, a tšea mošomo wa go ba mohlahli ka Lefapheng la go Thuba, ka 7th Infantry Training Centre. O ile a hlatlošwa go ba mokapotene ka Julae 1941, gomme ka morago a romelwa bjalo ka mothuši wa molaodi go a href22nd20Commando20Squadron2028Australia2922nd Independent Companya, a romelwa le bona go ya Timor  <response>: e le karolo ya Sparrow Force ka December 1941. Ka morago o ile a etelela ma-commando pele nakong ya lesolo la bona sehlakahlakeng gomme ka July 1942 o ile a hlatlošwa ka nakwana go ba molaodi. 