 The same year as this sarin mishap, President Richard Nixon reaffirmed a no first-use policy on chemical weapons as well as renouncing the use of biological agents.When the U.S. BW program ended in 1969, it had developed seven standardized biological weapons in the form of agents that cause anthrax, tularemia, brucellosis, Q-fever, VEE, and botulism.In addition, Staphylococcal Enterotoxin B was produced as an incapacitating agent.