An astronaut in training, in the cockpit of the Manned Aerospace Flight Simulator in Dallas, Texas.
<a href="//commons.wikimedia.org/wiki/NASA" title="NASA">NASA</a>
<a rel="nofollow" class="external free" href="http://ngm.nationalgeographic.com/flashback/2013#close-modal">http://ngm.nationalgeographic.com/flashback/2013#close-modal</a>, credited to NASA; also published in July 2013 print issue of <i>National Geographic</i> with same credit and caption.