Historically, as a vast island nation isolated from major conflict zones, Australia was naturally shielded from direct military threats. This was especially true during the post-Cold War era under a US-led unipolar order , which afforded Australia a profound sense of security. However, the 2023 Defence Strategic Review (DSR) makes it clear that "the era of peace has come to an end," driven by three primary catalysts: The Shift to a Multipolar World: Escalating competition between the United States and China has become the defining force reshaping the global order. Advanced Long-Range Warfare: The proliferation of modern weaponry, space capabilities, and cyber warfare means adversaries can now strike or disrupt Australia from afar, completely bypassing the need for a traditional amphibious invasion. Vulnerabilities in Global Supply Chains: Today's threats are less about territorial conquest and more about the "blockade...