U.S. President Donald Trump announced Saturday that he’s picked a battle-hardened commander who oversaw troops in Iraq and Afghanistan to be the nation’s next top military adviser.

If confirmed by the Senate, Gen. Mark Milley, who has been chief of the Army since August 2015, would succeed Marine Gen. Joseph Dunford as chairman of the Joint Chiefs of Staff. Dunford’s term doesn’t end until Oct. 1. Trump said the date of transition is “to be determined.”

Trump used an early morning tweet to reveal his choice. “I am thankful to both of these incredible men for their service to our Country!” he said.

Dunford is a former commandant of the Marine Corps and commander of coalition troops in Afghanistan. Milley commanded troops during several tours in Iraq and Afghanistan.

Dunford’s spokesman, Col. Patrick Ryder, said all indications are that Dunford will serve his full term. He said Dunford congratulated Milley on his nomination. “He has served with Gen. Milley in peacetime and in combat and has the highest regard for his leadership.”

Sen. Lindsey Graham, R-S.C., a member of the Senate Armed Services Committee, said in a statement that Milley was “a battle-tested commander and Pentagon reformer who will be a worthy successor” to Dunford.

Trump’s decision had caught some in the Pentagon by surprise when unofficial word spread Friday after he had tweeted that a succession announcement was coming.

(SD-Agencies)