A U.S. Navy Grumman S2F-1 <i>Tracker</i> of Anti-submarine Squadron VS-21 "Lightning Bolts" in flight with radar and MAD-sensor deployed. VS-21 was assigned to the aircraft carrier USS <i>Princeton</i> (CVS-37) for a deployment to the Western Pacific and the Indian Ocean from 5 January to April 1956.
USN
U.S. Navy photo <a rel="nofollow" class="external autonumber" href="http://www.navysite.de/cruisebooks/cv37-56/030.htm">[1]</a> from the <a rel="nofollow" class="external text" href="http://www.navysite.de/cruisebooks/cv37-56/index_002.htm">USS <i>Princeton</i> (CVS-37) 1956 cruise book</a> available at <a rel="nofollow" class="external text" href="http://navysite.de/cruisebooks/index.html">Navysite.de</a>