Randomized controlled trial comparing GMI to control treatment (CT) across five critical outcomes. 186 Veterans in VA housing services (93 per treatment arm) will be enrolled with a diagnosis of alcohol or drug abuse/dependence. Recruitment will take place in Charleston VA Medical Center HUD-VASH & GPD. Participants will be randomly assigned to (1) GMI or (2) CT, each consisting of 4 sessions, and will be evaluated at 1, 3, and 6 months. Participants with a non-substance related DSM-V disorder (e.g., major depressive disorder, PTSD) will be eligible for the study. Analyses will be conducted using generalized linear mixed models (GLMM) approach.