20mm guns fire at a target drone in a simulated torpedo attack during a gunnery practice aboard the U.S. Navy aircraft carrier USS <i>Enterprise</i> (CV-6) on 3 April 1942.
U.S. Navy photo <a rel="nofollow" class="external text" href="https://www.history.navy.mil/content/history/museums/nmusn/explore/photography/ships-us/ships-usn-e/uss-enterprise-cv-6/80-g-16955.html">80-G-16955</a>