Operation Whitecoat was a biodefense medical research program carried out by the United States Army at Fort Detrick, Maryland between 1954 and 1973. The program pursued medical research using volunteer enlisted personnel who were eventually nicknamed "Whitecoats". These volunteers, all conscientious objectors, including many members of the Seventh-day Adventist Church, were informed of the purpose and goals of each project before providing consent to participate in any project. The stated purpose of the research was to defend troops and civilians against biological weapons.

Fort Detrick is a United States Army Futures Command installation located in Frederick, Maryland. Fort Detrick was the center of the U.S. biological weapons program from 1943 to 1969. Since the discontinuation of that program, it has hosted most elements of the United States biological defense program.