Iran

Shanahan announced the move Friday to "safeguard U.S. forces given the ongoing threat posed by Iranian forces."

In targeting the IRGC, the administration is zeroing in on the organization most responsible for maintaining the regime.

Mattis emphasized diplomacy and cooperation as critical to beating back the tide of radical terrorism around the world.

Acting Defense Secretary Shanahan defended the Pentagon's move to carry out a joint show of force in the Persian Gulf.

The Lincoln Carrier Strike Group and Marines performed extensive training ops in the Arabian Sea this weekend.

The U.S. would likely go it alone without allied support in a conflict with Iran.

U.S. Central Command has rejected a commander's assertion that Iran posed "no increased threat" to U.S. troops.

B-52 bombers that deployed to the Middle East to counter unspecified threats from Iran have begun patrols in the Persian Gulf...

Despite recent claims of possible action by Iran, a top Operation Inherent Resolve official sees no change in the situation.

The move came after U.S. officials said they were dispatching a show of military strength in response to threats from Iran.