On December 2, 2015, 14 people were killed and 22 were seriously injured in a terrorist attack at the Inland Regional Center in San Bernardino, California, which consisted of a mass shooting and an attempted bombing. Both Suspects targeted a San Bernardino County Public Health Training Event. The first responders at the scene were Probation Officers from San Bernardino County, who at the time never received any formal Active Shooter training. An Active Shooter are person(s) engaged in killing or attempting to kill people in a confined populated area. Active Shooters use firearms and usually no pattern or method to their selection of victims. All law enforcement personnel can help prevent and prepare for potential active shooter situations. Active Shooter Training provides guidance to Probation Officers, staff, including managers, and personnel, so that they can prepare and be alert to an active shooter situation. This course is invaluable for all Probation personnel to prepare for active shooter situations.