Many events across the United States take place during May 10 to May 17. Armed Forces Day in on May 17. During this time, we honor Americans in uniform who served their country in times of war and peace. Those who are honored on this day include people who serve the Army, Navy, Marines, Air Force, Space Force and Coast Guard. National Guard and Reserve units may celebrate Armed Forces Day/Week over any period in May because of their unique training schedules.