Lloyd Austin has received United States Senate confirmation to become the nation’s first black Defense Secretary.
The 93-2 vote gave approval for the retired US Army General to join President Joe Biden's cabinet, before he is sworn in at the Pentagon.
He will receive an intelligence briefing, as well as speaking with NATO Secretary General, Jens Stoltenberg.
Avril Haines was confirmed on Wednesday as the first woman to serve as director of national intelligence.
Mr Biden is expected to win approval for others on his national security team in coming days, including Antony Blinken as secretary of state.
The president is looking for Mr Austin to restore stability in the Pentagon, which went through two Senate-confirmed secretaries of defence and four who held the post on an interim basis during the Trump administration.
The most recent of those, David Norquist, held the post for a matter of days, prior to today's announcement.
In his first message addressing the US Armed Forces, Mr Austin acknowledged "doing my job also means helping our country get control of the pandemic, which has killed more than 400,000 Americans".
Before heading to the Pentagon, Mr Austin wrote on Twitter: "It's an honor and a privilege to serve as our country’s 28th Secretary of Defense, and I'm especially proud to be the first African American to hold the position.
"Let’s get to work."
It’s an honor and a privilege to serve as our country’s 28th Secretary of Defense, and I’m especially proud to be the first African American to hold the position. Let’s get to work. pic.twitter.com/qPAzVRxz9L— Lloyd Austin (@LloydAustin) January 22, 2021
Mr Austin’s confirmation was complicated by his status as a recently retired general.
He required a waiver of a legal prohibition on a military officer serving as secretary of defence within seven years of retirement.
Mr Austin retired in 2016 after serving as the first black general to head US Central Command.
He was the first black vice chief of staff of the Army in 2012 and also served as director of the Joint Staff, a behind-the-scenes job that gave him an intimate view of the Pentagon’s inner workings.
The House and the Senate approved the waiver on Thursday, clearing the way for the Senate confirmation vote.
At his confirmation hearing on Tuesday, Mr Austin said he had not sought the nomination but was ready to lead the Pentagon without clinging to his military status and with full awareness that being a political appointee and Cabinet member requires "a different perspective and unique duties from a career in uniform".
As vice president, Mr Biden worked closely with Mr Austin in 2010 and 2011 to wind down US military involvement in Iraq while Mr Austin was the top US commander in Baghdad.
American forces withdrew entirely, only to return in 2014 after the so-called Islamic State extremist group captured large swathes of Iraqi territory.
At Central Command, Mr Austin was a key architect of the strategy to defeat IS in Iraq and Syria.
Mr Biden said in December when he announced Mr Austin as his nominee that he considered him "the person we need at this moment" and that he trusts him to ensure civilian control of the military.
Cover image: PA.