sentences:  After Nixon declared an end to the U.S. bio-weapons program, debate in the Army centered around whether or not toxin weapons were included in the president's declaration.Following Nixon's November 1969 order, scientists at Fort Detrick worked on one toxin, "Staphylococcus" enterotoxin type B (SEB), for several more months.Nixon ended the debate when he added toxins to the bio-weapons ban in February 1970.