What Is Mystery Weapon from 1981: Thirty years ago, under the Reagan administration, the US government began working on a secret weapon. Today on Secrecy News, Steven Aftergood asks what that weapon was.

A partially declassified memo (below), obtained by the Federation of American Scientists, blocks out the description, so it's not clear. It says: “The production and stockpiling of weapons is authorized with stockpiling being restricted to the United States .”

Aftergood says: "In all likelihood, said Hans Kristensen of FAS, the deleted term describing the weapons is 'enhanced radiation.' Two enhanced radiation weapons started production in August/September 1981, he noted: the W70 (Lance warhead) and the W79 (artillery shell)."