Book excerpt: For more than 20 years, the DoD has collected information regarding behavioral and health readiness of active duty military personnel through the Survey of Health Related Behaviors Among Military Personnel (Survey). In 2005, DoD initiated the ¿Dept. of Defense Lifestyle Assessment Program,¿ which incorporates the active-duty health behaviors study and expands the scope to include the National Guard and Reserves, as well as other special studies, the first of which will examine unit-level influences on alcohol and tobacco use. The 2005 Survey has two broad aims for active duty military personnel: (1) to continue the survey of substance use; and (b) to assess progress toward selected ¿Healthy People 2010¿ objectives. Charts and tables.