This book aids any researcher, policymakers and military personnel in researching small states and militaries, European defence and security policy, as well as contemporary and emerging threats. This edited collection gathers academic commentators on Irish defence policy, military leaders from across the service components of the Irish Defence Forces and European defence experts to contribute to the first in-depth conversation and analysis on modern Irish defence and its application within the European Union. The aim of this edited book is to ascertain what capabilities are robust, which are lacking, what future threats need to be catered for, and what action is needed to ensure those threats will be addressed going forward. This book will explore emerging issues and applications of modern and contemporary threats within the context of Ireland, Europe and Western institutions. We have invited submissions from scholars, commentators, policymakers and military practitioners to evaluate the Irish Defence Forces and to illustrate the complexities facing small nations in formulating and resourcing defence and national security policy.