Analysis of information sources in references of the Wikipedia article "Mustard gas" in English language version.
(...) on the night of July 12, 1917 (...)
(...) 'Ypres,' a name used by the French, because the compound was first used at Ypres (...)
... the Department of Veterans Affairs made two promises: to locate about 4,000 men who were used in the most extreme tests, and to compensate those who had permanent injuries.
And it wasn't just African-Americans. Japanese-Americans were used [...] so scientists could explore how mustard gas and other chemicals might affect Japanese troops. Puerto Rican soldiers were also singled out.