If a pact is struck in Vienna, it will be the beginning of a complex political and diplomatic process.

The president, in a rare visit to the Pentagon, was briefed on the campaign against the group.

The administration will leave its current top diplomat in place when the embassy reopens on July 20.

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Behold, the officer's ration pack. Enjoy!

'Our cooperation overall with France in the security sector has never stronger,' Defense Secretary Ashton Carter said.

The work of Adolf Tolkachev was a goldmine for the U.S., and especially so for the Air Force.

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As foreign ministers arrived in Vienna ready to seal a deal, negotiators said Tuesday’s deadline could slip.

EXCERPT | An agent who worked deep inside the Soviet military helped the United States command the skies.

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Measure aimed at helping feds detect terrorist threats, but critics fear intrusion on privacy and free speech.

Hybrid warfare is increasingly becoming an issue in national defense planning.

The U.S. secretary of state and Iran’s foreign minister have developed a friendly rapport over days of talks.

The foreign minister released a friendly video message as the long nuclear talks enter their final hours.

The agreement addresses claims arising from the 2010 devastating oil spill in the Gulf of Mexico.

Tariq al-Harzi, who orchestrated the movement of fighters, died as his brother did a day earlier in Iraq.

Officials hope that the slow pace of training will pick up, but recruits face a host of challenges.

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