“Two hundred thousand Detroiters had served in the armed forces. Over 100,000 Detroiters volunteered as firefighters, air raid wardens, and other wartime emergency workers. Those who were not involved on the front lines or in the factories felt the effects of the war through rationing, which affected all consumption, from gasoline to cigarettes and meat.
Downtown, the Guardian Building had been converted into a control center for war production. All of the city’s heavy industry had been channeled into military production. For three years, M-5 tanks, Jeeps, and B-24 bombers rolled off the assembly line instead of commercial automobiles. The first freeways, the Davison and Willow Run (I-94), were built…”
-excerpt from: http://www.detroit.lib.mi.us/GoldenJubileeExhibit/GJ%20WEB/II_Wartime_Detroit.htm