80-G-24820:  Atlantic Convoy at sea, June 1942.  Signaling by light. (2015/10/20).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/127906254@N06/22370823671/">80-G-24820</a>