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We do not usually make movies about the mechanics who keep the planes working so that the pilots can fly them. We don't devote long speeches to the people who plate the needles needed for blood transfusion apparatus. We seldom recall the machinists who built the engines of our tanks.

But these people all contributed to the war efforts of the past. In this gallery, we look at the technologists behind the war from nuclear scientists to drone operators to the veterinarians who patched up horses in World War I.