https://newatlas.com/us-air-force-hypersonic-bomber-test/60146/

The US Air Force's new hypersonic missile took to the air for the first time as an AGM-183A Air Launched Rapid Response Weapon (ARRW) went aloft on June 12th from Edwards Air Force Base, California. Strapped under the wing of a B-52 Stratofortress bomber, the engine-less prototype was not dropped, but was equipped with sensors to record drag and vibrations on the vehicle and the aircraft.