Background: Homelessness, substance use, and co-occurring psychiatric disorders form a mutually perpetuating, downwardly spiraling triad that maintains a state of homelessness, increases morbidity and mortality and thereby escalates health care utilization and costs. Addiction treatment is one portal of health care entry accessed by many Veterans with this devastating triad, yet addiction treatment fails to address homelessness directly. Homeless Veterans entering addiction treatment have worse treatment outcomes and incur more costs than housed Veterans entering such treatment. Further, many homeless Veterans never obtain housing after treatment entry and substantial proportion of those who do may subsequently return to homelessness. Assertive community treatment / intensive case management shows promise in improving housing status, as well as substance use and mental health outcomes in this population. Life Skills Training, which has been shown to improve the likelihood of maintaining housing, may increase the effectiveness of this method of treatment. An approach to homelessness incorporating assertive community treatment / intensive case management and Life Skills Training has never previously been integrated into VA addiction specialty care.