Mass shootings are part of U.S. and international cultures. Last year, terrorists shot 77 dead at a summer camp on the island of Utøya in Tyrifjorden, Buskerud. Last week, a shooting at a movie theatre in Aurora, Colo., left 12 people dead and 59 injured, according to authorities. Such events can happen anywhere, in rural and urban areas, on islands, and movie theaters. So it is crucial fire departments train with other public-safety agencies for such incidents. August Vernon ...