Sixteen years ago today, 5,000 innocent Iraqi civilians perished under a barrage of mustard gas; nerve agents sarin, tabun and VX; and possibly cyanide. The brutal attack, launched by their own government, earned Saddam Hussein the dubious distinction of becoming the first world leader in modern times to have used chemical weapons on his own people. The victims of the attack were residents of Halabja, 150 miles northeast of Baghdad and just south of the Iranian border. Three-quarters of them were women and children. The chemical attacks on what has come to be known as "Bloody Friday" were the most...