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naval ship specially designed to transport and deploy troops, vehicles, and supplies onto foreign shores for the conduct of offensive military operations. LSTs were designed during World War II to disembark military forces without the use of dock facilities or the various cranes and lifts necessary to unload merchant ships. They gave the Allies the ability to conduct amphibious invasions at any location on a foreign shore that had a gradually sloped beach. This ability permitted the Allies to assault poorly defended sectors, thereby achieving operational surprise and, in some cases, even tactical surprise.