Iran

The head of Iran's fast-boat navy maintains that the U.S. is all bluff.

Limpet mines have also been used in other recent attacks attributed to Iran.

Joint Chiefs Chairman Gen. Joseph Dunford said the U.S. faces a new and varied threat from 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.