Chuck Resnik (left), brother of the late space shuttle

Chuck Resnik (left), brother of the late space shuttle Challenger astronaut Judy Resnik, and Robert Lightfoot (right), acting administrator, NASA, participate in a public wreath-laying ceremony at the Tomb of the Unknown Soldier in observance of NASA’s Day of Remembrance at Arlington National Cemetery, Arlington, Virginia, Jan. 25, 2018. This annual event pays tribute “to the crews of Apollo 1 and space shuttles Challenger and Columbia, as well as other NASA colleagues who lost their lives while furthering the cause of exploration and discovery,” according to NASA. (U.S. Army photo by Elizabeth Fraser/Arlington National Cemetery/released)