"American production" . "Military production during World War II" . . "mass-produced many vehicles and weapons" . . "military aircraft production during World War II" . "armament plants" . "military production during World War II" . "production during World War II" . "Military production during World War II" . "war production" . "wartime production" . . "American machines" . . "Soviet annual aircraft production" . "military production" . "total military truck production" . . "war-time production" . "the war effort" . "Italian industry was relatively weak compared to other major powers in Europe" . "industrial output" . "15 million" . "America produced more artillery pieces, tanks, ships, and aircraft" . "mass-produced many vehicles" .