The U.S. has spent years racing to develop hypersonic weapons to compete with China and Russia, but delays, shifting programs and limited testing capacity constraints are raising concerns that Washington remains in a catch-up phase in a technology that could reshape modern warfare.
Key programs have faced repeated delays, including setbacks in testing and development timelines, while others have been canceled and later revived as the Pentagon reassesses its approach.
At the same time, limited testing infrastructure has constrained how quickly new systems can be evaluated and refined, slowing the pace of development across multiple efforts.
That combination has heightened concern inside the Pentagon, particularly as China and Russia already have fielded hypersonic systems, potentially giving them an edge in a class of weapons that could compress decision-making timelines in a crisis and challenge U.S. defenses.
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Hypersonic weapons are designed to travel at extremely high speeds while maneuvering in flight, making them far harder to detect and intercept than traditional missiles.
Unlike ballistic missiles, which follow a predictable path, hypersonic weapons can change direction mid-flight and fly at lower altitudes, reducing warning time and making them more difficult for existing missile defenses to track.
Russia already has used hypersonic-type weapons in its war against Ukraine, in some cases as a signal to Kyiv and its Western allies, underscoring how the technology is beginning to shape real-world conflict.
Inside the U.S. portfolio, however, progress has been uneven. Some programs are advancing toward deployment, others have been canceled and revived, and officials are increasingly balancing investments between building hypersonic weapons and defending against them.
Part of the challenge is technical. Hypersonic systems must survive extreme heat and pressure while traveling at high speeds through the atmosphere—making them more complex to design and build than traditional missiles.
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In some cases, the Pentagon also has pursued more advanced approaches, including highly maneuverable systems and precision conventional strike capabilities, adding further complexity.
Complicating that effort further is a basic constraint: testing capacity.
With only a limited number of facilities able to simulate or sustain hypersonic speeds, programs often face delays waiting for test opportunities, slowing development across multiple efforts.
Mark Bigham, vice president of defense programs at Longshot, a company that works on hypersonic launch and testing technologies, and a former Raytheon executive, said that constraint has become a key limiting factor.
“People can innovate and create really fast,” Bigham said. “And the only way you can sort them out is to actually test them.”
He added that only a handful of facilities can test systems at hypersonic speeds, making it difficult to increase the pace of development.
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“I would say the testing is probably the bottleneck right now,” he said.
Beyond engineering and testing challenges, the U.S. effort has also been shaped by years of shifting priorities.
After leading early hypersonic research in the 2000s, defense spending shifted toward counterterrorism operations and other capabilities, while funding for high-speed weapons remained inconsistent until more recently.
At the same time, strict safety and reliability requirements can slow the transition from testing to deployment, extending timelines compared to adversaries that may field less mature systems more quickly.
The Pentagon’s most advanced effort, the Army’s long-range hypersonic weapon — known as “Dark Eagle” — has made recent progress, including a successful joint Army–Navy test in March and continued fielding of its first operational unit.
That program is part of a broader push to streamline development, including the use of a shared glide body across Army and Navy systems.
Even so, the broader hypersonic portfolio remains in flux.
The Air Force has revived its air-launched rapid response weapon, or ARRW, after shelving the program following test setbacks, requesting roughly $387 million in fiscal 2026 to begin procurement.
The move reflects a reassessment inside the Pentagon, where officials now see a need for multiple types of hypersonic weapons for different missions.
At the same time, the U.S. increasingly is investing in ways to counter hypersonic threats.
In April, the Missile Defense Agency awarded roughly $475 million in additional funding to Northrop Grumman to accelerate development of the Glide Phase Interceptor, designed to destroy hypersonic weapons mid-flight.
The funding has pushed the program’s timeline forward, with initial operational capability now expected in the early 2030s after earlier delays.
The effort is part of a broader push to build defenses against hypersonic threats, including a space-based tracking network designed to detect and follow missiles traveling at extreme speeds—something current radar systems struggle to do reliably.
The urgency stems from the fact that China and Russia already have fielded hypersonic weapons, forcing the U.S. to both accelerate its own development and rethink how it defends against a new class of threats.
“My gut tells me that we need to step on the gas and move faster,” Bigham said.
Yet despite that urgency, the administration’s latest budget places greater emphasis on missile defense, drones and other capabilities, with hypersonic programs largely embedded within broader research and procurement accounts.
That disconnect — between the strategic importance of hypersonics and the pace of U.S. development — has fueled debate over whether the U.S. can scale these systems quickly enough to compete with its adversaries.
For now, the Pentagon’s hypersonic effort is moving forward — but with programs at different stages, revived initiatives and persistent constraints, the path to fully fielding these weapons remains uncertain.
The Pentagon did not immediately respond to a request for comment.
A Government Accountability Office review found the Air Force’s Hypersonic Attack Cruise Missile program fell about six months behind schedule on a key design milestone, pushing flight testing back by roughly a year and reducing the number of planned test flights. The findings highlight broader delays affecting U.S. hypersonic development.