Marine Corps Gen. Thomas D. Waldhauser, commander of U.S. Africa Command, testified before the House Armed Services Committee on national security challenges and U.S. military activities in Africa, March 6, 2018. - Marine Corps Gen. Thomas D. Waldhauser, commander of U.S. Africa Command, testified before the House Armed Services Committee on national security challenges and U.S. military activities in Africa, March 6, 2018.