As U.S. air defenses intercept Iranian missiles, the Pentagon is concerned that American missiles are vulnerable to enemy air defenses.

Consequently, DARPA wants a hypersonic scramjet cruise missile that is capable of evading enemy interceptors.

“Future U.S. military operations face increasingly significant challenges from the rapid proliferation and advancement of highly capable Integrated Air Defense Systems (IADS) by peer adversaries,” warned DARPA’s Request for Information, which is due October 6. “These systems threaten to restrict the operational freedom of U.S. forces and diminish the effectiveness of current stand-off strike capabilities.”

The Next Generation Hypersonic Cruise Missile, or NGHCM, aims to demonstrate that it is possible to develop a cruise missile that is both survivable and affordable enough to be manufactured in large quantities.

“This demonstrator must establish the foundation for a next-generation capability that delivers a revolutionary leap in operational performance—specifically in range, cruise speed, and/or altitude,” DARPA said. “DARPA strongly encourages responses to this RFI from non-traditional defense contractors and emerging technology developers.”

The RFI asks companies to address three “focus areas.” The first is the overall missile concept.

“How does the architecture balance advancements in foundational physical parameters (payload, range, speed, altitude) against other critical factors (e.g., midcourse maneuverability, signature, or platform capacity) to achieve a revolutionary leap in mission effectiveness and survivability?” the RFI asks.

The missile’s launch platform is another consideration. Potential options listed in the RFI include tactical fighters, external or internal mounts on heavy bombers, surface-based vertical launch systems, and “Heavy Ground-Launch / Strategic Defense Class” platforms that would “maximize the range/payload advantages of an airbreathing cruiser paradigm at larger scales.”

DARPA is also looking for a weapon that could be quickly fielded. Companies are asked to “identify an optimized, accelerated schedule to reach first flight for the major technical milestones and review gates, rather than relying on traditional, sluggish acquisition models.”

The second focus area involves demonstrating technologies such as “air-breathing propulsion systems, high energy density fuels, advanced booster technologies, high-temperature materials, thermal management solutions, and high-performance power generation/ actuation/fuel systems.”

The third focus area seeks innovative ways to test the missile quickly. While the RFI doesn’t specify technical parameters, it does note that testing should address “the ability to scale to different missions and distances from 250 nautical miles – 2000 nautical miles.”

The RFI does not specify a speed requirement, although hypersonic is defined as an object traveling faster than Mach 5.

DARPA also wants a hypersonic missile that can be tested without drawing too much attention.

“These concepts should advance the state-of-the-art for collecting critical flight test data allowing for rapid deployment and execution while providing fewer observable indicators of imminent testing,” the RFI said.

Russia has already fielded a hypersonic scramjet cruise missile in the form of the 3M22 Zircon.

Russia has launched Zircons at Ukraine, and Ukraine claims to have downed some of them with U.S.-made Patriot interceptors.