James Mattis

Defense Secretary Jim Mattis addressed the peace talks Friday at the Pentagon.

The SecDef said diplomacy is his first choice, but "we are always updating those plans" for the military option.

SecDef Jim Mattis said the audit identified "multiple material weaknesses" but few savings opportunities.

Former U.S. Secretary of Defense Jim Mattis testified Wednesday in the trial of fallen tech star Elizabeth Holmes.

Retired Marine Gen. James Mattis is a legend in the military.

Bing West's new novel, The Last Platoon, is a cautionary tale about America's "Forever War."

As supporters of the president stormed the U.S. Capitol, former defense secretaries urged him to stop the violence.

President Donald Trump's first secretary of defense delivered a sharp rebuke to him Wednesday night.

Ten former defense secretaries said the election results are valid and Joe Biden won.