May 21
1420
With the betrothal of Henry VI, King of England to Catherine de Valois of France, England & France swear perpetual peace.
1956
The United States conducted the first airborne test of an improved hydrogen bomb, dropping it from a B-52 bomber over the tiny island of Namu, part of the Bikini Atoll in the Pacific Ocean. The United States first detonated a hydrogen bomb in 1952 in the Marshall Islands, also in the Pacific. This bomb was far more powerful than those previously tested and was estimated at 15 megatons or larger (one megaton is roughly equivalent to 1 million tons of TNT). Observers said that the fireball caused by the explosion measured at least four miles in diameter and was brighter than the light from 500 suns.
1978
4,300 rally at Bangor Naval Base, Washington, to protest against nuclear sub USS Trident.
1971
Members of American Indian Movement(AIM) occupy Naval Air Station near Milwaukee, Wisconsin.
1981
The U.S. Senate approved a $20 billion program to return U.S. to full-scale production of chemical and nerve-gas weapons. Though the U.S. maintained a public policy opposing chemical weapons, it extended financial and military assistance to Iraq in its war against Iran, despite its almost daily use of such weapons. Iraq had developed its “CW production capability, primarily from Western firms, including possible a U.S. foreign subsidiary.” (from a memorandum to Secretary of State Alexander Haig)
Watch a video on the U.S./Saddam Hussein partnership

Donald Rumsfeld and Saddam Hussein
1993
Kyrgystan announces plans to dismantle its army.