 Complete the following phrase:  When the Second World War broke out, McKinnon was in England on an artillery training course. He joined the Second New Zealand Expeditionary Force and served with the 3rd New Zealand Division during the campaign in the Solomon Islands. He was initially commander of the 28th Heavy Anti-Aircraft Regiment but when his unit was disbanded in July 1942 he took over 29th Light Anti-Aircraft Regiment. With his regiment, he landed on the Treasury and 