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

Aired: 6/22/2015 | 0:07:44 | Clip
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.