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  • May 5, 1948 - Joint Chiefs of Staff brief President Truman on "Half-moon," their nuclear war plan. The plan calls for dropping 50 atomic bombs on 20 Russian cities; Truman disapproves.
  • May 15, 1957 - The United Kingdom tests its first thermonuclear weapon at the Christmas Islands in the Pacific.
  • May 24, 2015 - Women Cross DMZ crosses the border between North and South Korea to draw attention to the need for a permanent peace treaty.
  • May 25, 2009 - North Korea conducts its second nuclear test. The blast of about one-third the power of the bomb dropped on Hiroshima by the United States in 1945 is conducted underground.
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