As the United States began to gear up for a major war, information and propaganda efforts were set in motion. Civilians (including children) were encouraged to take part in fat, grease, and scrap metal collection drives. Many factories making non-essential goods retooled for war production. Levels of industrial productivity previously unheard of were attained during the war; multi-thousand-ton convoy ships were routinely built in a month-and-a-half, and tanks poured out of the former automobile factories. Within a few years of the U.S. entry into the Second World War, nearly every man fit for service, between 18 and 30, had been conscripted into the military "for the duration" of the conflict, and unprecedented numbers of women took up jobs previously held by them. Strict systems of rationing of consumer staples were introduced to redirect productive capacity to war needs.