Player Embed Code: Download Embed Share Top Military Commanders Testify Defense.gov Feb. 13, 2020 | 01:28:51 Air Force Gen. Terrence J. O'Shaughnessy, commander of North American Aerospace Defense Command and U.S. Northern Command, and Navy Adm. Charles A. Richard, commander of U.S. Strategic Command, testify at a Senate Armed Services Committee hearing, Feb. 13, 2020.