Anticipated Impacts on Veterans' Healthcare: The investigators' study will obtain important scientific and clinical knowledge about the efficacy of an evidence-based gender specific model of treatment (A Woman's Path to Recovery) for women Veterans with substance use disorder (SUD), compared to an existing model that is not gender specific (12-Step Facilitation). 12-Step Facilitation focuses on encouraging attendance at 12-step groups such as Alcoholics Anonymous. If the gender-specific approach to treatment is more effective than 12-Step Facilitation for Veterans with SUD in the VA, it may substantially improve the physical and mental health outcomes of women Veterans, and decrease healthcare costs by providing a replicable method for delivering treatment.