"What counts most in war is [the] most difficult to count." -- Defense Secretary Jim Mattis.
The Iranian people "aren't buying" the regime's act, Defense Secretary Jim Mattis said.
His name pops up several times in the book "Fire and Fury: Inside the Trump White House," by Michael Wolff.
Mattis said there was little chance North Korea could use Olympics talks as a wedge to set Washington and Seoul at odds.
Conventional troops are slated to take some of the burden off Special Forces in 2018.
Defense Secretary Mattis noted that military exercises have been rescheduled in the past for political or diplomatic reasons.
The U.N. reported more than 100 civilians have been killed in airstrikes in Yemen in just the past 10 days.
Last July, Trump sent out a Tweet announcing a ban on transgender individuals serving in the military.
For only the second time since 9/11, America's defense secretary didn't visit troops in a war zone during December.
U.S.-backed forces were in the process of "crushing the life" out of ISIS , Defense Secretary Jim Mattis said Friday.