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File picture, showing a four-rotor Enigma machine, right, once used by the crews of German U-boats in World War II to send coded messages, which British World War II code-breaker mathematician Alan Turing, was instrumental in breaking, and which is widely thought to have been a turning point in the war.

Last Friday it was revealed in the Washington Post that the Chinese hacked into crucial U.S. military networks, gaining access to dozens of weapons systems. "This is billions of dollars of combat advantage for China. They've just saved themselves 25 years of research and development. It's nuts," a senior official told the Post.

While certainly troubling, it isn't the first time the U.S. goverment has found itself with a major intelligence leak or security breach. From the Mexican-American war to WikiLeaks, the U.S. has long been dealing with headline-grabbing intelligence leaks. "

Here is a list of 15 of the most infamous security leaks/breaches in history.

See the list of the most infamous leaks, security breaches in U.S. history.

Freeman Stevenson is a Snow College grad and is the DeseretNews.com opinion intern. Reach me at fstevenson@deseretdigital or @freemandesnews