During World War I, 65 of Morristown School's first 103 graduates (63%) served in the U.S. military. Their service reflected the value of community service emphasized by Morristown School to its student body. During the war, students at the school raised funds to purchase and equip the Morristown School Ambulance. They then presented this ambulance to the American Field Service for use in France. The American Field Service awarded Morristown School a certificate and a brass plaque to show its appreciation for the ambulance. In 1913, a group of 40 of Morristown School's students helped the Morristown Fire Department extinguish a forest fire that had spread over three miles on Horse Hill; the students used portable chemical extinguishers to fight the flames. Nine years later, the full student body (173 students) helped fight a large fire that had destroyed two nearby houses. In 1957, the basketball team donated a trophy to Delbarton School (the school rival) to honor Paul Kreutz, a Delbarton player who drowned in 1956.
