President Kennedy signing the Limited Nuclear Test Ban Treaty in the Treaty
Room at the White House.

The treaty banning nuclear weapon tests in the atmosphere, in outer space and
under water, often referred to as Nuclear Test Ban Treaty (NTBT). It was signed
by the governments of the Soviet Union, the United Kingdom, and by the United
States. The treaty was signed by President John F. Kennedy on Monday October
7, 1963 and went into effect on October 10th.

The first page of the Nuclear Test Ban Treaty