This month marks 20 years since Officer Joe Diman and his new partner, Gary Buro, responded to a domestic disturbance in Chesterfield County, Va. Moments after arriving and entering the house, Buro was shot and killed. Despite being shot five times during an ensuing gun battle, Diman was able to subdue the gunman, something that almost certainly saved the lives of the gunman’s girlfriend and her son, who were inside the home.