NASA astronauts Joe Acaba (left) and Mark Vande Hei

NASA astronauts Joe Acaba (left) and Mark Vande Hei (center) watch the Changing of the Guard Ceremony at the Tomb of the Unknown Soldier at Arlington National Cemetery, Arlington, Virginia, June 15, 2018. While at ANC, Vande Hei and Acaba presented to Col. Jerry Farnsworth, chief of staff, Arlington National Cemetery and Army National Military Cemeteries, an ANC Employee Patch that was flown aboard the International Space Station (ISS) during Expeditions 53/54. They also presented Col. Jason Garkey, regimental commander, 3d U.S. Infantry Regiment (The Old Guard), with a Tomb Guard Identification Badge that was also flown on the ISS. (U.S. Army photo by Elizabeth Fraser / Arlington National Cemetery / released)