According to oral history studied by Thomas R.H. Havens, traditional paternalistic norms proved a barrier when the government wanted to exploit woman power more fully for the war effort. Compulsory employment in munitions factories was possible for unmarried women, but social norms prevented married women from doing that sort of work, in sharp contrast to Russia, Britain, Germany and the United States. The absence of so many young men dramatically disrupted long-standing patterns of marriage, fertility, and family life.