mustard gas

. US military admits it carried out secret race-based experiments to test impact of mustard gas on US soldiers
. Secret World War II Chemical Experiments Tested Troops By Race

а если не by race - тогда нет проблем?

A total of 60,000 enlisted men were part of a secret government program that wasn't declassified until 1993 that tested mustard gas and other chemical agents on U.S. troops during WWII. - Defense Dept: Mustard gas experiments done on WWII soldiers