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By Jeff Mason and Patricia Zengerle

WEST PALM BEACH, Fla./WASHINGTON (Reuters) - U.S. President Donald Trump on Monday named Lieutenant General Herbert Raymond McMaster as his new national security adviser, again turning to the U.S. military to play a central role on his foreign policy team.

McMaster is a highly regarded military tactician and strategic thinker, but his selection surprised some observers who wondered how the officer, who is known for questioning authority, would deal with a White House that has not welcomed criticism.

"He is highly respected by everybody in the military and we're very honored to have him," Trump told reporters in West Palm Beach where he spent the weekend. "He's a man of tremendous talent and tremendous experience."

McMaster replaces a Trump loyalist. Michael Flynn, a retired Army lieutenant general, was fired as national security adviser on Feb. 13 after reports emerged he had misled Vice President Mike Pence about speaking to Russia's ambassador about U.S. sanctions before Trump's inauguration.

The ouster, coming so early in Trump's administration, was another upset for a White House that has been hit by miscues, including the controversial rollout of a travel ban on people from seven Muslim-majority countries, since the Republican president took office on Jan. 20.

Trump also named Keith Kellogg, a retired U.S. Army General who has been serving as the acting national security adviser, as chief of staff to the National Security Council. John Bolton, a former U.S. ambassador to the United Nations, would serve the administration in another capacity, Trump said.

Kellogg and Bolton were among those in contention as Trump spent the Presidents Day long weekend considering his options for replacing Flynn. His first choice, retired Vice Admiral Robert Harward, turned down the job last week.

The national security adviser is an independent aide to the president and does not require confirmation by the U.S. Senate. The role has varied from administration to administration, but the adviser attends National Security Council meetings along with the heads of the State Department, the Department of Defense and key security agencies.

McMaster, 54, is a West Point graduate known as "H.R.," with a PhD in U.S. history from the University of North Carolina at Chapel Hill. He was listed as one of Time magazine's 100 most influential people in 2014, partly because of his willingness to buck the system.

A combat veteran, he gained renown in the first Gulf War - and was awarded a Silver Star - after he commanded a small troop of the U.S. 2nd Army Cavalry Regiment that destroyed a much larger Iraqi Republican Guard force in 1991 in a place called 73 Easting, for its map coordinates, in what many consider the biggest tank battle since World War Two.