330-CFD-DN-ST-90-01866:  A Mark 45 5-inch/54-caliber gun mount stands on a test platform at the Naval Ordnance Station, Louisville, Kentucky, 11/22/1989.   (OPA-NARA II-2015/12/24).
<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@N06/23836270682/">330-CFD-DN-ST-90-01866</a>