The Office of Juvenile Justice and Delinquency Prevention (OJJDP) established UDETC to support its Enforcing Underage Drinking Laws (EUDL) Program. PIRE operated UDETC from 2004 to 2015. The Center’s mission was to provide science-based, practical, and effective training and technical assistance (TA) services to states and communities working to combat underage drinking through law enforcement and environmental strategies. The UDETC provided a variety of evidence-based TA and innovative technologies to support all 50 states, the District of Columbia, and 5 U.S. territories. The UDETC’s personalized services supported strengthening of task forces and collaborative linkages, as well as developing the leadership capacity of EUDL coordinators. The project pursued its mission by offering cutting-edge educational learning practices such as training of trainers, distance learning courses, experiential exercises, tool kits, webinars, publications, onsite strategic technical assistance, and other services. The Center’s website and toll-free number supported rural and hard-to-reach areas, providing a cost-effective option for grantees and others with limited funds and resources. UDETC also provided strategic assistance to grantees for developing long-term sustainability plans for their underage drinking efforts. Over the project’s lifetime, PIRE trained more than 100,000 people, including attendees at 10 National Leadership Conferences; provided technical assistance to more than 25,000 people; had more than 7 million hits on the UDETC website; developed 120 issues of Success Stories; and published 110 issues of Resource Alert. PIRE’s UDETC staff developed 33 evidence-based publications and tool kits, and more than 30 training curricula in enforcement and environmental strategies.