nation went from a surplus manpower pool with high unemployment and relief in 1940 to a severe manpower shortage by 1943. The industry realized that the Army urgently desired production of essential war materials and foodstuffs more than soldiers. (Large numbers of soldiers were not used until the invasion of Europe in summer 1944.) In 1940–43 the Army often transferred soldiers to civilian status in the Enlisted Reserve Corps to increase production. Those transferred would return to work in essential industry, although they could be recalled to active duty if the Army needed them. Others were discharged if their civilian work was deemed essential. There were instances of mass releases of men to increase production in various industries. Working men who had been classified 4F or otherwise ineligible for the draft took second jobs. In the figure below an overview of the development of the United States labor force, the armed forces and unemployment during the war years. One contentious issue involved the drafting of fathers, which was avoided as much as possible. The drafting of 18-year-olds was desired by the military but vetoed by public opinion. Racial minorities were drafted at the same rate as Whites and were paid the same. The experience of World War I regarding men needed by industry was particularly unsatisfactory—too many skilled mechanics and engineers became privates (there is a possibly apocryphal story of a banker assigned as a baker due to a clerical error, noted by historian Lee Kennett in his book "G.I.") Farmers demanded and were generally given occupational deferments (many volunteered anyway, but those who stayed at home lost postwar veteran's benefits.) Later in the war, in light of the tremendous amount of manpower that would be necessary for the invasion of France in 1944, many earlier deferment categories became draft eligible. Religion In the 1930s, pacifism was a very strong force in most of the Protestant churches. Only a minority of religious leaders, typified by Reinhold Niebuhr, paid serious attention to the threats to peace posed by Nazi Germany, Fascist Italy, or militaristic Japan. After Pearl Harbor in December 1941, practically all the religious denominations gave some support to the war effort, such as providing chaplains. Typically, church members sent their sons into the military without protest, accepted shortages and rationing as a war necessity, purchased war bonds, working munitions industries, and prayed intensely for safe return and for victory.