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PBS News Hour

Why the U.S. military exposed minority soldiers to toxic gas

During World War II, the U.S. government conducted experiments with mustard gas and other chemicals on thousands of American troops. A new NPR investigation has found that some military experiments singled out African-American, Japanese-American and Puerto Rican servicemen by race. Judy Woodruff learns more from Caitlin Dickerson of NPR and Susan Smith of University of Alberta.
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February 27, 2026 - PBS News Hour full episode
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