premise: Winter Soldier is a 1972 documentary film chronicling the Winter Soldier Investigation which took place in Detroit, Michigan, from January 31 to February 2, 1971. The film documents the accounts of American soldiers who returned from the War in Vietnam, and participated in this war crimes hearing.
hypothesis: Winter Soldier was filmed in Wisconsin
reason: The Winter Soldier Investigation took place in Detroit, Michigan but it does not say where it was filmed