One of them, United States v. O'Brien, was argued before the Supreme Court. The act of draft card burning was defended as a symbolic form of free speech, a constitutional right guaranteed by the First Amendment. ... From 1965 to 1973, very few men in the US were convicted of burning their draft cards.
The Gulf of Tonkin Resolution was created and used during the Vietnam War. The resolution gave the president nearly unlimited control over the U.S. military.