During World War II, scientists funded by the United States government conducted mustard gas experiments on 60,000 American soldiers as part of military preparation for potential chemical warfare. One aspect of the chemical warfare research program on mustard gas involved race-based human experimentation. In at least nine research projects conducted dur ing the 1940s, scientists investigated how so-called racial differences affected the impact of mustard gas exposure on the bodies of soldiers. Building on cultural beliefs about “race,” these studies occurred on military bases and universities, which became places for racialized human experimentation.