In recent years, the sheriff's office has redefined its response to active-shooter situations. Instead of relying on multiple officers to confront a shooter, they are now trained in how to respond as a single officer, Cameron said. All the officers in the department went through a full day of training at an elementary school on the new response tactics, Cameron said. Officers also are outfitted with first-aid kits and have training in combat medicine. In the Great Mills case, the deputy, school nurse and others provided first aid to the teens who were shot, including applying a tourniquet, Cameron said.