<a href="https://en.wikipedia.org/wiki/Vietnam_War" id="mwtQ" rel="mw:WikiLink" title="Vietnam War">Vietnam War</a>: <a href="https://en.wikipedia.org/wiki/Attack_on_USNS_Card" id="mwtg" rel="mw:WikiLink" title="Attack on USNS Card">An explosion</a> sinks the American aircraft carrier USNS <i id="mwtw">Card</i> while it is docked at Saigon. Two Viet Cong <a href="https://en.wikipedia.org/wiki/Frogman" id="mwuA" rel="mw:WikiLink" title="Frogman">combat swimmers</a> had placed explosives on the ship's hull. She is raised and returned to service less than seven months later.