The Unit Guide: The Australian Army, 1939–1945 by Graham R. McKenzie-Smith Big Sky Publishing, 2018, six volumes, $209.99 __________________________________ Australia reluctantly entered the Second World War on September 3, 1939, two days after Hitler’s surprise attack on Poland, and it remained a combatant until Imperial Japan’s surrender on August 15, 1945. West Australian military historian, Graham McKenzie-Smith says that during that seventy-two-month-long global conflict more than 725,000 Australians, men and women, served in the nation’s Army. The Royal Australian Air Force and Royal Australian Navy together added a further 268,000 personnel, bringing the nation’s total to nearly a million men…