With more than 60% new material reflecting advances in evidence-based treatments and the evolving roles of military mental health providers, the authoritative resource in the field is now in a significantly revised third edition. The volume provides research-based roadmaps for prevention and intervention with service members and veterans in a wide range of settings. Up-to-date information about military procedures and guidelines is included throughout. Grounded in current knowledge about stress and resilience, chapters describe best practices in treating such challenges as depression, anxiety disorders, posttraumatic stress disorder, and substance use disorders. Also addressed are operational functions of psychologists in personnel assessment and selection, counterintelligence, and other areas.