 The U.S. Air Force has flown the X-51A Waverider technology demonstrator and the U.S. Army has flight tested the Advanced Hypersonic Weapon.China later confirmed the successful test flight of a "hypersonic missile delivery vehicle," but claimed it was part of a scientific experiment and not aimed at a target.US Air Force National Air and Space Intelligence Center estimated that by 2022 the number of Chinese nuclear warheads capable of reaching the United States could expand to well over 100.