Twenty-three-year-old U.S. Marine Corps Corporal Sara A. Medina went to Nepal to help people. She died in a helicopter crash on May 12, alongside five other Marines. Thirty-year-old U.S. Air Force Captain William DuBois was killed on November 30 when his F-16 went down shortly after takeoff, in the midst of combat operations against the self-declared Islamic State. U.S. Army Major General Harold Greene and Specialist John Dawson were killed respectively on August 5 and April 8 while providing assistance to Afghan forces. One man was fifty-five. The other was twenty-two. These are the men and women, along with countless others from previous generations, for whom Memorial Day exists.