This book explores the process through which service members transition from military to civilian life, and the implications of that transition on their mental and physical well-being and functioning. The authors present a theoretical framework that helps conceptualize the process of military transition. The theory is broken into three overlapping components: approaching military transition, which outlines the personal, cultural and transitional factors that create the base of the transition trajectory; managing the transition, which explores the factors impacting the transition's trajectory; and assessing the transition, which describes the outcome of the transition in the realms of work, family, health, and general well-being. The authors then demonstrate how this framework can be applied to practice, providing an opportunity to redefine how we help veterans.