Pentagon's Hypersonic Weapons Programs Face Delays and Technical Challenges

The U.S. Government Accountability Office (GAO) has released a new report highlighting significant challenges faced by the Department of Defense in delivering hypersonic weapons to military units on schedule. The report identifies three major programs—the Air Force’s Hypersonic Attack Cruise Missile (HACM), the Army’s Long Range Hypersonic Weapon, and the Navy’s Conventional Prompt Strike—as being at risk due to delays or incomplete testing phases. These issues stem from the rapid acquisition pathways used for these projects, which are designed to expedite development but may not be suitable for immature technologies.

Specifically, the GAO report emphasizes concerns over the Air Force's HACM program, noting that delays in finalizing the missile’s design have led to a reduction in planned flight tests from seven to five. This adjustment is part of an effort to adhere to the Middle Tier Acquisition (MTA) pathway requirements, which mandate rapid prototyping and fielding within five years. However, if additional issues arise during testing, such as significant failures, it could push the weapon past its projected timeline.

To mitigate these risks, the Air Force has prioritized activities that support HACM’s initial flight tests, including risky strategies like conducting parts validation simultaneously with design completion. Such practices increase the likelihood of redesigns and delays if any part fails during testing. The service's budget request for fiscal year 2027 includes $404 million to begin purchasing HACM weapons and an additional $806 million for continued testing, capability enhancement, and industrial base capacity investments.

The GAO report also underscores the broader implications of starting production before a system has been fully demonstrated. This approach increases the risk of discovering deficiencies that could necessitate costly and time-consuming rework. Previous experiences with other hypersonic programs, such as the AGM-183A Air-Launched Rapid Response Weapon (ARRW), have shown similar challenges during testing phases, leading to delays in procurement decisions.