As part of an evaluation of the Marine Corps Operational Stress Control and Readiness (OSCAR) program, this report describes the methods and findings of a large survey of marines who were preparing for a deployment to Iraq or Afghanistan in 2010 or 2011. The results are among the first to shed light on the pre-deployment mental health status of marines, as well as the social resources they draw on when coping with stress and their attitudes about seeking help for stress-related problems.