Pentagon leaders review 20-year war in Afghanistan

The leaders of the US armed forces have looked back on the nation's longest war. Defense Secretary Lloyd Austin and Joint Chiefs of Staff Chairman General Mark Milley both served in Afghanistan during the 20-year conflict.

Austin outlined his views on the mission and the airlift of more than 120,000 people, including 6,000 Americans. He called the evacuation "heroic" and "historic."

The last troops left early Monday, a day ahead of the deadline for them to pull out. The Taliban took control of the country in the weeks before the Americans left.

Milley said, from his experience, the Taliban are a "ruthless group." He said whether or not they change remains to be seen.

US officials have taken in more than 20,000 Afghan refugees. They still have to process another 40,000 evacuees at US bases overseas.