The U.S. full involvement in the Vietnam War culminated in the Gulf of Tonkin Resolution leading to an increment of U.S. military presence in Vietnam .
U.S. full involvement escalated further following the 1964 Gulf of Tonkin incident , in which a U.S. destroyer clashed with North Vietnamese fast attack craft , which was followed by the Gulf of Tonkin Resolution , which gave the U.S. president authorization to increase U.S. military presence .
Vietnam War