[4] The scramjet propelled the missile at "a speed greater than Mach 5" (about 3,300 miles per hour).

[5] Further testing was carried out in mid-March 2022, but was kept secret at the time to avoid the impression of escalation against Russia during the Russian invasion of Ukraine.

[7] On 30 January 2023, the final successful flight test of the HAWC was reported by DARPA and Lockheed Martin - like its previous flight test, the missile was able to fly at (3,300 mph; 5,300 km/h ) speed at the altitude of more than 60,000 ft (11 mi; 18 km) for more than 300 nautical miles (350 miles; 560 km), and demonstrated improved performances and capabilities.

DARPA plans to further these technological improvements through More Opportunities with HAWC program (MOHAWC).

[8][9][10] Technology developed for the HAWC demonstrator was used to influence the design of the Hypersonic Attack Cruise Missile (HACM), a U.S. Air Force Program of Record to create a scramjet-powered hypersonic missile it could deploy as an operational weapon.