[The American war in Southeast Asia featured the most widespread use of chemical warfare since World War I. Earlier, the British had resorted to chemicals in their colonies, Italy did so in Ethiopia, and Japan in China in the 1930s and 1940s. These were lethal chemicals where the Americans thought theirs were not. Iraq in the 1980s made the largest-scale known use of lethal chemical weapons in its Iran war and against its Kurdish minority. But two elements distinguished the U.S. effort in Vietnam. First, massive quantities of these chemicals were used, as the below article makes clear. The amounts cited are equivalent to roughly 60,000 tons of chemical agent. By comparison, in the 1972 Christmas Bombing of North Vietnam, which some hold to be the decisive air campaign of the war, and including both B-52 bombers and tactical aircraft, the Nixon administration loosed some 36,000 tons of munitions over Hanoi and its environs.