40 mm Bofors Mark 1 twin mounts firing during a gunnery drill aboard the U.S. Navy escort carrier USS <i>Attu</i> (CVE-102), in 1944.
USN
U.S. Navy photo <a rel="nofollow" class="external autonumber" href="http://navysite.de/cruisebooks/cve102-45/006.htm">[1]</a> from the <a rel="nofollow" class="external text" href="http://navysite.de/cruisebooks/cve102-45/index_004.htm">USS <i>Attu</i> (CVE-102) World War II cruise book</a> available at <a rel="nofollow" class="external text" href="http://navysite.de/cruisebooks/index.html">Navysite.de</a>