Pentagon admits difficulty in defending against hypersonic missiles.

The United States Department of Defense is Racing to Develop Hypersonic Missiles and Effective Defenses

The United States Department of Defense (DOD) is seeking nearly $30 billion in its $680 billion Fiscal Year 2024 (FY24) budget request for missile defeat and defense programs across all branches of the military. Right now, the DOD is in a race to develop its own hypersonic missiles and engineer effective defenses against the high-velocity, maneuverable missiles being developed by Russia and, particularly, by the Peoples Republic of China (PRC).

Existing Systems Have “Capabilities” Against Hypersonic Weapons

During questioning by Senate Armed Services Committee’s Strategic Forces Subcommittee Chair Sen. Angus King (I-Maine) in a May 9 budget hearing, four flag officers said some existing systems have “capabilities” against hypersonic weapons but did not know for sure until they are tested against the evolving missile systems.

King was not happy. “It seems to me that we are spending a lot more money to developing hypersonic missiles than we are developing capabilities to defend against them,” he said.

Defending Against Hypersonic Missiles

King asked Missile Defense Agency Director Vice Adm. Jon A. Hill if an aircraft carrier could be defended against a hypersonic missile attack.

“We have the capability to stop it in two places, in the boost-glide phase” and when the missile re-enters the atmosphere, Hill said, noting the Navy’s SM-6 missiles are “cruise missile killers” designed to track and kill fast-moving, maneuverable targets that can fly high and skim the surface. “It would be defeated by a destroyer defending a carrier.”

Noting Ukrainians claim they shot down a Russian hypersonic weapon last week with a Patriot anti-air missile provided by the U.S., Hill said the Patriot systems, Terminal High Altitude Area Defense missiles (THAAD), and Aegis ballistic defense system all have “capability” demonstrated in tests against hypersonics.

“THAAD operates on the edge of the atmosphere,” he said. “We haven’t tested it against hypersonic, but I’m willing to bet there are capacities that we can leverage there.”

Investments in Regional Ballistic, Cruise, and Hypersonic Missile Defense Capabilities

Assistant Secretary of Defense for Space Policy John F. Plumb said the budget request “makes substantial investments in regional ballistic, cruise, and hypersonic missile defense capabilities,” including $1.2 billion for PAC-3 Patriot missile “interceptors,” $1 billion for Aegis and THAAD interceptors, and $259 million for regional hypersonic and ballistic missile defense space sensors and the development of a Glide Phase Interceptor (GPI) missile system.

Active Denial System

An operational version of the Active Denial System, a directed energy weapon that is the equivalent of science fiction’s heat ray, is being developed by the U.S. Air Force.

King said these ant-missile systems are based on technologies from the 1980-90s and asked why DOD is not experimenting with using direct energy weapons to knock down missiles.

At $4 to $10 million each, using missiles in a “bullet on bullet approach is an expensive proposition” in defending against other missiles.