Australia and New Zealand lacked naval-industrial depth

Fleet weakness stemmed from the interwar failure to build both heavy industry and the skilled workforce that industry would sustain. Immigration and domestic development had not produced enough technical trades because economic policy had not deliberately expanded the industrial jobs that would attract and train them. Australia and New Zealand consequently entered the war with cruiser-centered forces, some capable destroyer and smaller-ship crews, but little capacity for rapid expansion. Allied transfers could replace an individual loss or add a few destroyers, yet neither dominion possessed the yards, personnel pool, or supply chain needed to create a much larger navy during the war.