US-Australia Conducts First Flight Test of Hypersonic Attack Cruise Missile

• •The HACM flight test marks a significant milestone for U.S.-Australia hypersonic collaboration.
• •The missile is designed to exceed Mach 5 using a scramjet propulsion system.
• •Operational success depends on the ability to protect airbases from Chinese long-range fires.

The U.S. Air Force and Royal Australian Air Force have conducted the first flight test of the Hypersonic Attack Cruise Missile (HACM) over an undisclosed Australian test range. This test is part of the Southern Cross Integrated Flight Research Experiment, aimed at advancing hypersonic capabilities. The HACM, developed by RTX and Northrop Grumman, uses a solid rocket booster and scramjet engine to exceed Mach 5. Despite delays and budget overruns, the Air Force is seeking $1.2 billion for maturation and initial procurement, aiming for fielding in fiscal 2027 and full-rate production by 2029. The operational effectiveness of the HACM hinges on the survivability of allied airbases against Chinese anti-access capabilities. The specific details of the test, including whether the missile achieved powered flight, have not been disclosed.