sentences:  Other agents, including anti-crop agents such as wheat stem rust, were stored at Beale Air Force Base and Rocky Mountain Arsenal.These anti-crop agents, along with agents at Fort Detrick used for research purposes were destroyed in March 1973.From the onset of the U.S. biological weapons program in 1943 through the end of World War II the United States spent $400 million on biological weapons, mostly on research and development.