During the winter of 1942, Private Harry Carpenter, U.S Army, made a big honking mistake when he decided to declare that the current war was "a white man's war". Arrested by the MPs and carted-off to stand before Magistrate Thomas O'Hara, Carpenter found that he had reaped the whirlwind: he was charged with treason against the United States.
Although Private Carpenter's case was introduced in the civil courts, there is an article on this site that pertains to the double standards in the military courts - click here to read it.