Personnel randomized into the treatment group will be able to download the Iwin app for free onto their personal device. The Pro‐Change Iwin application has been built using the IMS Health AppNucleus™ Platform. AppNucleus is a patented, federally certified (FIPS 140‐2, DIACAP MAC II Sensitive), secure application platform that enables Pro‐Change to rapidly deploy secure mHealth solutions to users via web portal and commercial mobile technologies (such as iOS, Android, Windows Phone, Blackberry). The application provides an innovative, tailored program using best practices in behavior change science and innovative technology to assist military personnel in preventing substance abuse and enhancing well‐being by providing them with the most appropriate intervention content at the right time for their individual needs. It delivers assessments and tailored feedback immediately on eleven different risk behaviors as well as mobile interactive staged matched activities, engaging game‐like features and in‐app notifications on each behavior they are at risk for over the course of 6 months. The app will provide reminders for users to return to the program as set time points. Both treatment and control participants will receive e-mail reminders to complete follow-up assessments at 6 and 9 months.