Mark Milley, the retiring chairman of the Joint Chiefs of Staff. Alex Wong/Getty Images hide caption
joint chiefs of staff
Republican Sen. Tommy Tuberville, pictured here speaking to reporters in the U.S. Capitol on July 10, has blocked hundreds of military nominations, causing logistical hurdles across the service. Drew Angerer/Getty Images hide caption
Air Force Gen. John Hyten speaks at Offutt Air Force Base in Nebraska during a change of command ceremony at U.S. Strategic Command in November. Joint Chiefs Chairman Gen. Mark Milley is behind, listening. Hyten is now vice chairman of the Joint Chiefs of Staff. Nati Harnik/AP hide caption
Gen. Mark Milley, chairman of the Joint Chiefs of Staff, attends a media briefing earlier this year at the Pentagon. He told NPR on Thursday that the U.S. military is still considering "a whole series of protocols" when it comes to the coronavirus. Olivier Douliery/AFP via Getty Images hide caption
Army Chief of Staff Gen. Mark Milley speaks on a panel during the Association of the United States Army's annual meeting on Oct. 5. Allison Shelley/Getty Images hide caption
President Trump has appointed Gen. Mark Milley to succeed Joint Chiefs Chairman Gen. Joseph Dunford. Andrew Harnik/AP hide caption