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The Justice Department says 30-year-old Jareh Sebastian Dalke of Colorado Springs was arrested Wednesday after allegedly passing information to an undercover FBI agent he believed was a representative of an unnamed foreign government.

Inside a small building surrounded by a gate on a military base in Anchorage, Alaska, sits one of North America's most important first lines of…

Army Gen. Paul Nakasone, head of the secretive National Security Agency and Cyber Command, is promising more aggressive cybermeasures against rivals. And he's talking about it — at least a little.

Generals, admirals, former national security officials, and scientists have signed a letter to the president warning that climate change is a threat to national security.

In an interview with NPR, President Obama said once people see the nuclear deal in action, they will "recognize that whatever parade of horribles was presented in opposition have not come true."

The president has approved surveillance flights over Syria to search for targets for possible airstrikes. But critics of the administration say that may not be enough.

The journalist, who received a cache of highly classified documents, says no one disputes that the security agency should be reading emails from al-Qaida, but the system has become too powerful.

The Army plans to take all Apache attack helicopters from the National Guard. The Guard says that's an insult, but Army leaders say it's not personal — it's just about saving money.

When 3,000 average citizens were asked to forecast global events, some consistently made predictions that turned out to be more accurate than those made with classified intelligence.

The suit is the first direct challenge to the FISA Amendments Act, the statute the government relies on to collect international communications in bulk.