A veteran of conflicts in Iraq and Afghanistan, the retired four-star army general, 67, beat out the favorite for the job, former under-secretary of defense Michele Flournoy, amid pressure on Biden to nominate more minorities for positions in his cabinet.

CNN, Politico and the New York Times cited unnamed sources familiar with the decision, after Biden said earlier Monday that he had made his choice and would announce it on Friday. Austin would require Senate confirmation to take up the post.

He spent four decades in the army, graduating from the West Point Military Academy and following a career with a wide range of assignments, from leading platoons to running logistics groups and overseeing recruiting, to senior Pentagon jobs.

In March 2003 he was the assistant division commander of the 3rd Infantry Division when it marched from Kuwait into Baghdad in the US invasion of Iraq.

From late 2003 to 2005, he was in Afghanistan commanding the Combined Joint Task Force 180, the principle US-led operation seeking to stabilize the security situation in the country.

In 2010 he was made commanding general of US forces in Iraq, and two years later became the commander of the Central Command, in charge of all Pentagon operations in the Middle East and Afghanistan.

- Few African Americans in command jobs -

Austin retired from the military in 2016, and joined the board of directors of Raytheon Technologies, one of the Pentagon's largest contractors.

He would require special approval from the Senate due to federal law that requires military officers to wait seven years after retirement before serving as the Pentagon chief.

The waiver has happened twice -- most recently for general Jim Mattis, the first defense secretary in the administration of President Donald Trump.

But members of the Senate agreed begrudgingly, amid concerns over Trump's views on the military, and several said at the time that they wouldn't want to do it again.

"He shouldn't be considered for the same reason that Sec. Mattis shouldn't have been," said Congressman Justin Amash in a tweet.

"The law prohibits recently retired members of the Armed Forces from serving in this civilian capacity. Biden would be the second president in a row to violate this norm."

Austin would take responsibility for the 1.2 million active service members, of which about 16 percent are Black.

But Blacks serve disproportionately in the lower ranks and few have achieved high command positions.

The issue became more clear over the past year when African American servicemen and women expressed support for the national Black Lives Matter movement against police racism and abuse.

Former defense secretary Mark Esper said he held numerous listening sessions to make White soldiers understand what the Black colleagues felt.

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