21 photos that show just how imposing US aircraft carriers are

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Aircraft carriers are the cornerstone of America's naval capabilities. They're able to project air power anywhere in the world without having to depend on local bases. And they are truly massive.

Spanning 1,092 feet long -- three times the length of a football field -- Nimitz-class warships like the USS George H.W. Bush are the largest aircraft carriers.

See the gallery above for a selection of pictures showing how massive America's aircraft carriers are.

Watch more below:

US Drone Makes First Carrier Landing
US Drone Makes First Carrier Landing