Acting NASA Administrator Robert Lightfoot speaks to NASA personnel and others during a wreath laying ceremony at the grave markers of Apollo 1 astronauts Virgil "Gus" Grisson and Roger Chaffee as part of NASA's Day of Remembrance, Tuesday, Jan. 31, 2017, at Arlington National Cemetery in Arlington, Va. The wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration.

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Keywords: acting, administrator, arlington, cemetery, day, joel, kowsky, lightfoot, nasa, national, remembrance, robert, usa, va, virginia