The Honorable William J. Walker was sworn in as the 38th Sergeant at Arms of the U.S. House of Representatives on April 26, 2021 and served during the 117th Congress. An elected officer, the Sergeant at Arms is the chief law enforcement, security, and protocol officer of the House of Representatives. Previously, he served by Presidential appointment as the 23rd Commanding General of the District of Columbia National Guard. General Walker led National Guard civil support to the U.S. Capitol Police following the January 6, 2021, attack of the Capitol, and subsequently provided command and control for over 28,000 Guardsmen assigned for the 59th Presidential inauguration. He also led National Guard support to the U.S. Secret Service at the White House, the U.S. Park Police, and the Metropolitan Police during the riots of 2020 following the murder of George Floyd.