Tanks have come a long way since they were first invented. These machines were named tanks because armies didn't want enemy troops to know they existed. Instead, they were said to hold water, like water tanks. Today's tanks have giant guns, heavy armor, and treads that can drive troops safely over any surface. These modern marvels help the military on missions around the world, and readers will love taking a look inside these vehicles to see what makes these military machines so special

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