80-G-42047:  WWII-North Atlantic Convoy. Shown:  USS Greer (DD-145).  Tense and alert, a twenty millimeter gun crew lets go practice bursts at sea, June 1943.   Official U.S. Navy Photograph, now in the collections of the National Archives.  (2017/06/06)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
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