February 13 - The U.S. Army begins to deploy anti-aircraft cannons to protect nuclear stations and military targets.
February 13 - The U.S. Air Force loses a Convair B-36 bomber that carried an Mk-4 atomic bomb off the west coast of Canada, and produces the world's first Broken Arrow.
February 14 - The Soviet Union and the People's Republic of China sign a mutual defense treaty.
March 1 - Klaus Fuchs is convicted in London of spying against both Britain and the United States for the Soviet Union, by giving to the latter top secretatomic bomb data.