A Mark XIII aerial torpedo porpoises after being dropped by a Grumman TBF-1 <i>Avenger</i> torpedo bomber from the  U.S. Navy aircraft carrier USS <i>Essex</i> (CV-9) during exercises, 30 March 1943. Note the two TBFs overhead, with the leading plane's torpedo bay doors open.
USN
Official U.S. Navy photo <a rel="nofollow" class="external text" href="http://www.history.navy.mil/our-collections/photography/numerical-list-of-images/nara-series/80-g/80-G-220000/80-G-228118.html">80-G-228118</a> from the U.S. Navy <a rel="nofollow" class="external text" href="http://www.history.navy.mil">Naval History and Heritage Command</a>