Austin, who is now retired, said that efforts to improve the situation of Afghan women should continue. Austin, 71, America's first black secretary of defence, announced the end of his tenure at the Department of Defence on Friday.
He served the US military for 41 years and is a four-star general and a Pentagon leader who has had combat experience.
Austin retired from the military in 2016, but returned to the Pentagon in 2021 by President Joe Biden and was appointed as the first black US secretary of defence.
Austin's tenure coincided with three major military crises, including the war in Ukraine, the withdrawal of US troops from Afghanistan, and the war in the Middle East.
"Over the past four years, we've stood up to our competitors, weakened our enemies, strengthened our friends, and invested in the future," Austin said at a ceremony marking the end of his tenure at Myer-Henderson Air Force Base.
However, his tenure coincided with the disastrous withdrawal of US troops from Afghanistan and the rise of the Taliban to power, which critics say is a historic defeat for the United States.
According to the Associated Press, the shocking fall of the Afghan government to the Taliban has affected Austin's tenure forever.