This book surveys the exciting opportunities that await psychologists in national security settings. The authors are experienced consulting psychologists who provide a richly detailed introduction for psychologists and graduate students. Their insider knowledge gives readers a rare glimpse into the workplace culture and group dynamics of national security organizations. The authors offer tips and strategies to prepare consultants as they navigate complex challenges and procedures, such as the security clearance process. They identify important qualities, competencies, and interpersonal skills that consultants must possess to adapt to these organizations and deliver effective psychological services to operations and support personnel. Ethical dilemmas are also examined, particularly situations in which a psychologist's professional and personal values may be tested by the nature of the work at hand. Illustrative case vignettes bring to life the day-to-day roles and responsibilities of consulting psychologists, highlighting the importance of their contributions and how rewarding this work can be.