The conceptual understanding of security and the practicalities of national defence are interdependent. In many countries both are undergoing significant change. This work provides an international context but focuses on Australian defence, arguing that a transition is underway from old security thinking to new, and that this is evidenced by changes in policies and practical activities. The aim of this work is to demonstrate the interdependence between the current reconceptualisation of security and the practicalities of national defence. Old security thinking concerns military power relationships between states, in contrast with new security thinking, which uses a broader conceptual framework. These are described, providing benchmarks for the subsequent analysis. While it is acknowledged that change has occurred in security thinking throughout history, those developments observed since the end of the Cold War and the rise of globalisation signify a fundamental shift. To explore this shift, recent developments in the defence policies and military activities of four relevant nations are examined, providing an international context for the consideration of the primary case study of Australian defence. This case study draws on historical descriptions and empirical data to analyse developments in four spheres - Australian defence policy, current Australian Defence Force activities, recent military developments and contemporary Australian public debate. The weight of evidence supports the thesis of a transition in both security thinking, described as transitional security thinking, and ADF activities. Tensions are observed between the requirements of defending a nation against attack, and contributing to the expanding requirements of the broadened security agenda. Despite these tensions, the expansion in both security thinking and the associated activities of armed forces, is likely to continue. This expansion has important implications for Australia???s defence capabilities which are increasingly required to meet the demands of refocused national security. These demands contribute to the pressing challenges of convergence and overstretch. A strategy of integration is recommended to address these challenges and it follows the principles of whole-of-government security and sustainable partnerships. The application of these principles will require the ADF to emphasise capabilities with versatility and adaptability.

The conceptual understanding of security and the practicalities of national defence are interdependent. In many countries both are undergoing significant change. This work provides an international context but focuses on Australian defence, arguing that a transition is underway from old security thinking to new, and that this is evidenced by changes in policies and practical activities. The aim of this work is to demonstrate the interdependence between the current reconceptualisation of security and the practicalities of national defence. Old security thinking concerns military power relationships between states, in contrast with new security thinking, which uses a broader conceptual framework. These are described, providing benchmarks for the subsequent analysis. While it is acknowledged that change has occurred in security thinking throughout history, those developments observed since the end of the Cold War and the rise of globalisation signify a fundamental shift. To explore this shift, recent developments in the defence policies and military activities of four relevant nations are examined, providing an international context for the consideration of the primary case study of Australian defence. This case study draws on historical descriptions and empirical data to analyse developments in four spheres - Australian defence policy, current Australian Defence Force activities, recent military developments and contemporary Australian public debate. The weight of evidence supports the thesis of a transition in both security thinking, described as transitional security thinking, and ADF activities. Tensions are observed between the requirements of defending a nation against attack, and contributing to the expanding requirements of the broadened security agenda. Despite these tensions, the expansion in both security thinking and the associated activities of armed forces, is likely to continue. This expansion has important implications for Australia???s defence capabilities which are increasingly required to meet the demands of refocused national security. These demands contribute to the pressing challenges of convergence and overstretch. A strategy of integration is recommended to address these challenges and it follows the principles of whole-of-government security and sustainable partnerships. The application of these principles will require the ADF to emphasise capabilities with versatility and adaptability.