Austin arrives at the inauguration ceremony Wednesday at the U.S. Capitol. Austin needed Congress to approve a waiver for him to serve as Pentagon chief because he hasn’t been out of uniform for the required seven years.

WASHINGTON, DC – JANUARY 20: Biden’s nominee for Secretary of Defense retired U.S. Army General Lloyd Austin arrives at
the inauguration of U.S. President-elect Joe Biden on the West Front of the U.S. Capitol on January 20, 2021 in Washington, DC. During today’s inauguration ceremony Joe Biden becomes the 46th president of the United States. (Photo by Drew Angerer/Getty Images)