sentences:  Chief of the CWS, Amos Fries, decided that such a program would not be "profitable" for the U.S. Japan's Shiro Ishii began promoting biological weapons during the 1920s and toured biological research facilities worldwide, including in the United States.Though Ishii concluded that the U.S. was developing a bio-weapons programs, he was incorrect.In fact, Ishii concluded that each major power he visited was developing a bio-weapons program.