View of the twin 3in/50 (7.6 cm) Mk 33 twin mount during gunnery practice aboard the U.S. Navy landing dock ship USS <i>Austin</i> (LPD-4), in 1976.
USN
Official U.S. Navy photograph <a rel="nofollow" class="external autonumber" href="http://navysite.de/cruisebooks/lpd4-76/021.htm">[1]</a> from the USS <i>Austin</i> (LPD-4) <a rel="nofollow" class="external text" href="http://navysite.de/cruisebooks/lpd4-76/index_003.htm">1976 Cruise Book</a>.