By utilizing the industrial infrastructure of the car factories in Detroit, the US Army was able to outproduce the Axis forces - with equipment like the ubiquitous Sherman tank, which was produced in the tens of thousands.
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With their reliable Garand rifle, Thompson SMG, Browning MGs, and (when a bit more punch was needed) the Bazooka - the GIs were well-equipped and supplied to take the fight from the D-Day beaches, through the bocage of Normandy, with Patton's boys only stopping when they reached the banks of the Rhine.
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