sentences:  Though initially, under George Merck, the WRS contracted several universities to participate in the U.S. biological weapons program, the program became large quickly and before long it was under the full control of the CWS.By November 1943 the biological weapons facility at Detrick was completed, in addition, the United States constructed three other facilities - a biological agent production plant at Vigo County near Terre Haute, Indiana, a field-testing site on Horn Island in Mississippi, and another field site near Granite Peak in Utah.According to an official history of the period, "the elaborate security precautions taken [at Camp Detrick] were so effective that it was not until January 1946, 4 months after VJ Day, that the public learned of the wartime research in biological weapons".