NASA Administrator Charles Bolden and his wife, Alexis, lay a wreath at the Tomb of the Unknowns as part of NASA’s Day of Remembrance, Wednesday, Jan. 28, 2015, at Arlington National Cemetery. The wreaths were laid in memory of those men and women who lost their lives in the quest for space exploration. Photo Credit: NASA/Joel Kowsky via NASA http://ift.tt/1v57rc7
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