The military parade in D.C. that will mark the U.S. Army's 250th anniversary is just around the corner, which means preparations are now underway.

Tanks and armored personnel carriers will roll along Constitution Ave. as military jets fly overhead. To protect D.C. streets from those heavy vehicles, the Army Corps of Engineers is putting down some metal plates on parts of the parade route.

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The parade includes 150 different vehicles, and 60 of them are large, heavy, tracked vehicles. Some can weigh up to 70 tons — which is why the metal plates are necessary.

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