PROJECT SUMMARY Though the majority of the military is composed of non-Hispanic white men, the number of racial/ethnic minority and women veterans has steadily increased in recent years. African-American/Black and Hispanic veterans make up the largest proportion of the minority veteran population (about 50% and 30% of minority veterans, respectively) and the number of women veterans, especially racial/ethnic minority women, is expected to grow. Noted differences in alcohol use and behavioral health symptoms of PTSD and depression, as well as behavioral health care access, have been reported for post-9/11 African-American/Black, Hispanic veterans, and women veterans. However, research on disparities in veterans’ behavioral health care service utilization and behavioral health symptomology primarily focuses on veterans’ use of VA facilities, therefore missing 50% of veterans not receiving VA care. Unfortunately, there is limited research on the associations between perceived discrimination and quality of behavioral health care or behavioral health care access among racial/ethnic minority and women veterans who receive care outside of the VA system. Further, the studies that do exist on disparities among veterans tend to be cross-sectional and they limit their examination of disparities to individual factors only and do not incorporate larger environmental factors. Thus, the current study seeks to extend prior work by recruiting 2,000 non-VA attending veterans with 4 years of follow up (bi annual assessments). First, in an attempt to better understand veterans’ experiences of discrimination, 65 veterans will be recruited for in depth qualitative interviews. Results of these interviews will inform (not determine) measurement in the larger study. Once completed, recruitment will begin for the longitudinal cohort. We will oversample for racial/ethnic minority veterans (70% of the total recruited sample; n =1,400) and women veterans (40% of both racial/ethnic minority and non-Hispanic white recruited veterans; n = 800). Outcome data will be collected on behavioral health symptoms, including alcohol use/disorder, PTSD, and depression, as well as behavioral health care access (alcohol use treatment receipt, preparatory behaviors, attitudes about treatment). Experiences of racial discrimination and sexism (e.g., dignity denial, microaggressions, gender discrimination, sexual harassment, health care discrimination) as well as minority based and military specific stressors will be collected each wave. In addition to individual level data, we will use publicly available datasets (e.g., Census) to gather data on neighborhood deprivation, poverty, income inequality, segregation, neighborhood violence, distance to health care facilities, and liquor/alcohol outlets. We will use machine learning models that incorporate all hypothesized predictors across both individual and environmental domains to determine which factors are most important in predicting behavioral...