The US started plans to construct its first nuclear battlefield weapon.
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The United States and Russia signed the Moscow Treaty, agreeing to limit their nuclear arsenals.
The world's first atomic bomb was detonated.
Colombia's militant group FARC agreed to lay down their weapons after 52 years of guerilla warfare.
The US tested the TX-17 thermonuclear bomb for the first time in Bikini Atoll of the Marshall Islands.
The first of 126 nuclear tests started at the Nevada Test Site.
