#SecDef

#SecDef: F-35s will help U.S. and Israel air forces operate more jointly and more effectively. Together, we will dominate the skies.

#SecDef Jim Mattis welcomed #NATO Secretary General @jensstoltenberg to the #Pentagon today for a bi-lateral meeting. @USNATO

“It’s all based on lethality!” - #SecDef James N. Mattis. Five separate services with one mission on the ground, in the sea, in the air and in space. Get to #KnowYourMil. ➡️

If General "Mad Dog" Mattis is selected as Secretary of Defense I will remain in the military for his entire tenure. #SecDef

We will do more than meet 5 challenges, we will ensure historic change is also historic progress. - #SecDef @CNASdc

#SecDef receives the @Glenn_College of #PublicAffairs 2017 Excellence in Public Service Award at 6:30 p.m. EDT on

#SecDef: New policy will allow us to access talent of transgender servicemembers to strengthen success of mission

#SecDef: Our military's excellence is not a birthright. We have to earn it again and again. We must stay competitive

"We're going to restore readiness … and we're going to build a more lethal force in the process," says #SecDef James N. Mattis

#SecDef: Our mission is demanding & constantly changing. I couldn't be prouder of you, for what you do every day. Thank you & farewell.

Congratulations to James Mattis, our 26th Secretary of Defense. Welcome, sir! #SecDef

Earlier today, #SecDef Mattis reassured U.S. allies in the Baltic states of Lithuania, Latvia and Estonia of American solidarity with them.

#SecDef Mattis delivers the keynote address at #ASC17 this morning at 8:30 am EDT.

#SecDef greets officers selected for the military fellows program @CFR_org in #NYC. Follow for more his current trip

#SecDef Carter administers the Oath of Office to the 22nd Secretary of the @USArmy @SECARMY Eric Fanning

WATCH LIVE: #SecDef Jim Mattis participates in a news conference at #NATO Headquarters at 7:30 a.m. EST on

#SecDef Jim Mattis speaks off the record with members of the press during a flight to #Hawaii today. #SecDefTravels

#SecDef Mattis is visiting #Denmark, #Lithuania & #London to reaffirm key #military alliances. Follow his travels:

#SecDef: Your job is to make sure no one can doubt that the American nuclear deterrent is strong.

#SecDef sees first hand how soldiers shoot down drones with cyber capability rifles @WestPoint_USMA #SDatUSMA