https://en.wikipedia.org/wiki/Fort_Detrick
Testing performed on Seventh-day Adventists, 1940–1974
The U.S. General Accounting Office issued a report on September 28, 1994, which stated that between 1940 and 1974, DOD and other national security agencies studied hundreds of thousands of human subjects in tests and experiments involving hazardous substances.
The quote from the study:
Many experiments that tested various biological agents on human subjects, referred to as Operation Whitecoat, were carried out at Fort Detrick, Maryland, in the 1950s. The human subjects originally consisted of volunteer enlisted men. However, after the enlisted men staged a sitdown strike to obtain more information about the dangers of the biological tests, Seventh-day Adventists (SDAs) who were conscientious objectors were recruited for the studies.[10]
The Army purchased an additional 147 acres (59 ha) in 1946 to increase the size of the original "Area A" as well as 398 acres (161 ha) located west of Area A, but not contiguous to it, to provide a test area known as Area B. In 1952, another 502.76 acres (203.5 ha) were purchased between West 7th Street and Oppossumtown Pike to expand the permanent research and development facilities.
Jeffrey Alan Lockwood wrote in 2009 that the biological warfare program at Ft. Detrick began to research the use of insects as disease vectors going back to World War II and also employed German and Japanese scientists after the war who had experimented on human subjects among POWs and concentration camp inmates. Scientists used or attempted to use a wide variety of insects in their biowar plans, including fleas, ticks, ants, lice and mosquitoes – especially mosquitoes that carried the yellow fever virus. They also tested these in the United States. Lockwood thinks that it is very likely that the U.S. did use insects dropped from aircraft during the Korean War to spread diseases, and that the Chinese and North Koreans were not simply engaged in a propaganda campaign when they made these allegations, since the Joint Chiefs of Staff and Secretary of Defense had approved their use in the fall of 1950 at the "earliest practicable time". At that time, it had five biowarfare agents ready for use, three of which were spread by insect vectors.[11]