Alvin York, popularized in the famous movie as Sergeant York, was a pacifist. After being drafted, he filed an appeal to the District Draft Board, based upon his membership in a group which was officially on record as opposed to war, and his appeal was denied. Alvin York was a member of a small Holiness group, the Churches of Christ in Christian Union. On his draft card he said "Don't want to fight."
Government interrigators would not take no for an answer. It appears that even if under threat, Alvin York became a convinced soldier.
His draft card can be seen below courtesy of National Archives.