An artist's impression of future U.S. Navy anti-submarine warfare in 1961.
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/ah196107.pdf">July 1961</a>, p. 6.