A U.S. Navy <i>Barracuda</i>-class submarine in front of the Submarine Diver Training Tower at Pearl Harbor, Territory of Hawaii (USA).
U.S. Navy
<a rel="nofollow" class="external text" href="http://www.navy.mil/ah_online/department_arch.html">U.S. Navy All Hands magazine</a> <a rel="nofollow" class="external text" href="http://www.navy.mil/ah_online/archpdf/ah195504.pdf">April 1955</a>, p. 67.