The author notes on page 9 of the preface,
"Many paid a terrible price. American workers in war-related industries in 1942-43 died or were injured in numbers twenty times greater than the American servicemen killed or wounded during those same years. At General Motors alone 189 senior executives died on the job during the war, trying to ensure final American victory."
This was a time when the labor force was increased dramatically and industry was engaged 24-7!
He further notes:
American industry " . . . produced two-thirds of all Allied military equipment used in World War II. That included 86,000 tanks, 2.5 million trucks and a half million jeeps, 286,000 warplanes, 8,800 naval vessels, 5,600 merchant ships, 434 million tons of steel, 2.6 million machine guns, and 41 billion rounds of ammuniciation-not to mention the greatest superbomer of the war, the B-29, and the atomic bomb."