Photos: A century of tanks

This is a 3-ton Ford tank from 1918. It was a two-person vehicle crafted from off-the-shelf Ford parts and powered by two Model T automobile engines. It could reach 8 mph. Fifteen thousand of these tanks were ordered, but only 15 had been produced by the end of World War I, and the tank never saw combat. One of the smallest tanks ever made, it had a .30 caliber Browning tank machine gun.

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Photo by Daniel Terdiman/CNET News.com