Day of Remembrance

Acting NASA Administrator Robert Lightfoot addresses employees and members of the public at the Space Shuttle Columbia and Challenger Memorials during a wreath laying ceremony during NASA's Day of Remembrance, Thursday, Jan. 25, 2018, Arlington National Cemetery in Arlington, Virginia. Wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: (NASA/Bill Ingalls)