During wartime, the need for mental health professionals intensifies, and the role they play is increasingly important. This comprehensive professional reference and text presents crucial knowledge for anyone who provides direct psychological services or consultation to military, law enforcement, or intelligence personnel, or who works to enhance operational readiness. Expert contributors describe the ins and outs of working within the military system and offer guidelines for effective, ethical practice. Among the clinical applications discussed are fitness-for-duty evaluations, suicide risk assessment and prevention, substance abuse treatment, and brief psychotherapy. Operational applications include such topics as combat stress, survival training, hostage negotiation, and understanding terrorist motivation.