January 17 - A B-52 bomber collides with a KC-135 jet tanker over Spain, dropping three 70-kiloton hydrogen bombs near the town of Palomares and one into the sea
August 16 - Vietnam War: The House Un-American Activities Committee begins investigations of Americans who have aided the Viet Cong with the intent to introduce legislation making these activities illegal. Anti-war demonstrators disrupt the meeting and 50 are arrested.