The United States had successfully conducted a “free flight” hypersonic missile test in mid-March. However, they kept it under wraps to not further escalate tensions with Russia as per the Pentagon, especially when President Biden was scheduled for a series of meetings in Europe to address the Russo-Ukrainian conflict last March 23. The Air Force and the Defense Advanced Research Projects Agency (DARPA) conducted the missile test in the same week of Biden’s Europe trip.

It was revealed that the Lockheed Martin and Aerojet Rocketdyne version of the Hypersonic Air-breathing Weapon Concept (HAWC) was successfully released from a B-52 Stratofortress bomber off the West Coast as per an unnamed defense official.

According to a DARPA press release published on Tuesday, the missile was boosted till its Aerojet Rocketdyne scramjet engine ignited, propelling it to a maintained cruise speed faster than Mach 5 for “an extended period of time.” The HAWC reportedly reached altitudes of 65,000 feet, with a range of more than 300 nautical miles. This achievement was due to the hypersonic missile’s air-breathing ability, which captures air from the atmosphere to achieve sustained propulsion.

“The speed and maneuverability of such hypersonic cruise missiles allow both evasion of defenses and quick strikes. Their kinetic energy can effectively destroy targets even without high explosives,” the release said.

This is the 2nd recorded successful flight for the Hypersonic Air-breathing Weapon Concept. According to DARPA, these systems could provide the US with significantly increased offensive striking abilities, especially at a time when the US’ military rivals have also begun to develop their own line of hypersonic missiles.

“This Lockheed Martin HAWC flight test successfully demonstrated a second design that will allow our warfighters to competitively select the right capabilities to dominate the battlefield,” HAWC program manager Andrew “Tippy” Knoedler said.

“We are still analyzing flight test data but are confident that we will provide the US Air Force and Navy with excellent options to diversify the technology available for their future missions,” he added.

An unarmed Minuteman III intercontinental ballistic missile launches during an operational test at 12:03 a.m., PDT, April 26, from Vandenberg Air Force Base, Calif. (DVIDS, U.S. Air Force photo by Senior Airman Ian Dudley). Source: https://www.dvidshub.net/image/3335456/minuteman-iii-launches-vandenberg
An unarmed Minuteman III intercontinental ballistic missile launches during an operational test at 12:03 a.m., PDT, April 26, 2017, from Vandenberg Air Force Base, Calif. (DVIDS, US Air Force photo by Senior Airman Ian Dudley)

The test was kept secret to not further strain relations with Russia. It was a similar decision to the postponement of the US’ Minuteman III intercontinental ballistic missile testing last March 2 upon the order of Defense Secretary Lloyd Austin. Another missile test of the Minuteman III was also canceled last April 1 to lower nuclear tensions with Russia.