Robert M. Lightfoot Jr., right, acting administrator of NASA, places a wreath at the Space Shuttle Challenger and Space Shuttle Columbia Memorials in Arlington National Cemetery during NASA’s Day of Remembrance, Jan. 31, 2017, in Arlington, Va. NASA says in a statement, “As we do every year at this time, today the entire NASA Family pauses for a Day of Remembrance to reflect on the legacy and memory of our colleagues who have lost their lives advancing the frontiers of exploration.” ( Army photo by Rachel Larue/Arlington National Cemetery/released)

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