Know your history. From the lips of the US Govt itself:
THE GOVERNMENT HAS SPONSORED EXTENSIVE TESTING, BUT PRECISE
INFORMATION ON TESTS AND PARTICIPANTS IS NOT AVAILABLE
Precise information on the scope and magnitude of government tests
and experiments involving human subjects is not available, and
exact numbers may never be known. However, our review of available
documentation and interviews with agency officials identified
hundreds of tests and experiments in which hundreds of thousands of
people were used as subjects. Some of these tests and experiments
involved the intentional exposure of people to hazardous substances
such as radiation, blister and nerve agents, biological agents,
LSD, and phencyclidine (PCP). These tests and experiments were
conducted to support weapon development programs, identify methods
to protect the health of military personnel against a variety of
diseases and combat conditions, and analyze U.S. defense
vulnerabilities.
Healthy adults, children, psychiatric patients,
and prison inmates were used in these tests and experiments.
Human Experimentation: An Overview on Cold War Era Programs
https://www.gao.gov/assets/t-nsiad-94-266.pdf