President Kennedy signs the ratified Limited Nuclear Test Ban Treaty. It was ratified on August 5, 1963, by the Soviet Union, the United Kingdom, and the United States. It prohibits nuclear tests or explosions under water, in the atmosphere, or in outer space.

Image 1: President Kennedy signs the ratified Limited Nuclear Test Ban Treaty. Robert Knudsen. White House Photographs. John F. Kennedy Presidential Library and Museum, Boston.

Image 2: Reproduction of Nuclear Test Ban Treaty Document. Msgr. Francis R. Seymour Collection, Archdiocese of Newark Archives/The Sixth Floor Museum at Dealey Plaza