Shortly after the April 20, 1999 tragedy at Columbine High School, law enforcement agencies throughout the United States and Canada began training on the "contact and extraction teams" approach to threat and casualty management during active violence. However, because conventional fire department and emergency medical services personnel lacked the risk appetite, procedures, training, and equipment to enter the warm zones of such environments and Tactical Emergency Medical Support (TEMS) providers weren't always readily available, significant delays in accessing, treating, and transporting victims remained. In the 26 years since that fateful spring day in Colorado, more and more law enforcement agencies, fire departments, and ambulance services have realized the importance of cooperative effort before, during, and after such critical incidents. This includes not only operations within the inner and outer perimeters but also at the training, command, and public messaging levels. Given the ever-increasing amount of mass violence now plaguing our society, virtually every public safety organization in North America is currently contemplating how to best achieve such collaboration. However, in many regions, numerous individuals and organizations well-versed in the National Incident Management System (NIMS) are advocating for the application of traditional command theories within unconventional environments, including the critical yet dynamic first 30 minutes. Unfortunately, as many of our peers have already discovered the hard way, "corralling guests and filling vests," running formal checklists, and relying on conventional communication is not only challenging but may ultimately hinder operations. In response to this dilemma, High-Risk Unified Commander (HRUC) was developed to provide front-line supervisors, public safety executives, and training officers with contemporary and realistic strategies, tactics, and related information they can then use to simultaneously “stop the killing, dying, and crying.” With three of the seven hours of content being interactive (including demonstrations of interior tactics and a tabletop exercise based on current trends), HRUC is a fast-paced yet comprehensive training program that offers emergency responders unparalleled information within a reasonable amount of time. Participants will also learn how to apply past lessons learned and resulting recommendations to future incidents occurring within urban environments with high operational tempo as well as rural ones with limited resources.