. "nuclear arsenal" . "Chemical Demilitarization" . "United States" . "US" . "its original chemical weapons stockpile" . "US military chemical weapons program" . "largest nuclear state" . . "U.S. chemical warfare program" . "U.S." . "large numbers of nuclear warheads" . "arsenal of the United States" . . "United States and weapons of mass destruction" . . "biological samples sent to Iraq" . . "United States and weapons of mass destruction" . "U.S. nuclear arsenal" . . . "American" . .