Tusi se faʻaauau mo lenei palakalafa - I le aso 13 o Oketopa 1939, na auai ai Campbell i le Second Australian Imperial Force (AIF), ma na tuʻuina atu ia te ia le numera tautua a le AIF VX21. Na muamua tofia o ia i le &lt;a href="2/1st%20Battalion%20%28Australia%29"&gt;2/1st Battalion&lt;/a&gt; o se Major, ae na avea ma Brigade Major o le 16th Brigade i lena lava aso. Na avea o ia ma Kamupani o le Poloaiga o Auaunaga Taua mo lana vaega i le Taua o Bardia
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