The choice of the Fox News host and veteran was outside the norm. But he was a dedicated supporter of President-elect Donald J. Trump during his first term.

What to Know About Pete Hegseth, Trump’s Pick for Defense Secretary

The choice of the Fox News host and veteran was outside the norm. But he was a dedicated supporter of President-elect Donald J. Trump during his first term.

President-elect Donald J. Trump has picked Pete Hegseth, a Fox News host and veteran of the wars in Iraq and Afghanistan, to lead the Pentagon and the 1.3 million active-duty men and women of the American military.

The choice of Mr. Hegseth, 44, was outside the norm of the traditional defense secretary. But he was a dedicated supporter of Mr. Trump during his first term.

“Pete is tough, smart and a true believer in America First,” Mr. Trump said in his announcement on Tuesday night. “With Pete at the helm, America’s enemies are on notice — our military will be great again, and America will never back down.”

But several Pentagon officials questioned Mr. Hegseth’s lack of experience — other than serving in the military — and raised concerns about his ability to win Senate confirmation, even with Republicans winning control of the chamber.