Abstract
This chapter examines the continuing importance of military security. It notes that International Relations has historically seen security almost entirely in terms of the military dimension, before going on to review the impact of the broadening of the concept of security on approaches to the study of its military dimension. It then analyses the key aspects of the traditional approach to military security and some of the most common ways in which states have sought to acquire it historically, such as war, alliances, and, more recently, nuclear deterrence. The chapter then reflects on some of the difficulties in acquiring military security, and ways in which its pursuit can sometimes reduce, rather than increase, security, before concluding with a reminder of the continuing centrality of military security, even within a significantly broadened understanding of security as a multifaceted concept.