The Hidden Cost of Readiness: GAO’s Warning on Weapon System Sustainment
A new April 2026 report by the U.S. Government Accountability Office, Weapon System Sustainment: DOD Identified Critical Cost Growth, and the Army Should Take Action to Yield Cost Savings, provides an important reminder that the cost of national defense does not end when a weapon system is acquired. Giving credit to GAO and its audit team, led by Diana Maurer, the report examines how the Department of Defense identifies and manages operating and support costs for major weapon systems across their life cycles. Its central conclusion is straightforward but consequential: sustainment costs remain one of the most significant pressure points in defense acquisition, and better execution of cost-reduction actions can produce substantial savings.
GAO explains that operating and support costs include repair parts, maintenance, contract services, engineering support, personnel, and other expenses necessary to keep weapon systems operational. These costs historically account for approximately 70 percent of a weapon system’s total life-cycle cost. That figure is significant because it shifts attention away from acquisition price alone and toward the much larger question of whether the government can afford to operate, maintain, modernize, and support systems over decades of use.
The report reviewed 36 weapon system sustainment reviews conducted by DOD for fiscal years 2023 and 2024. DOD identified 14 Army and Navy systems with “critical” operating and support cost growth. Under the statutory framework in place during the review period, critical cost growth meant either a 25 percent increase over the most recent independent cost estimate or a 50 percent increase over the original baseline estimate. The Air Force did not identify any systems with critical cost growth during the period reviewed.
GAO found that the causes of cost growth were recurring and often structural. The most common causes included extended operational life, increased quantities, previously omitted costs, unplanned costs, capability improvements, and increased operational tempo. In practical terms, systems often cost more to sustain because they remain in service longer than originally expected, are produced or deployed in greater numbers, receive added capabilities, or rely on updated estimates that capture costs previously excluded. These causes are not always evidence of mismanagement. In some cases, they reflect operational necessity or evolving national security requirements. But they do demonstrate why early life-cycle cost discipline is essential.
The most concrete finding involves the Army’s Common Remotely Operated Weapons Station, known as CROWS. GAO found that the Army had not fully implemented a software update intended to address a major maintenance issue. The update was expected to warn operators when travel locks had not been disengaged before powering up the system, reducing the risk of avoidable physical damage. GAO estimated that full implementation could save more than $130 million over the remaining life of the program. Yet, as of the report’s review, implementation remained incomplete, with less than half of systems reported as updated.
GAO’s recommendation is narrow but important: the Army should ensure timely implementation of the CROWS software update. DOD agreed. The broader lesson, however, is that sustainment reform does not always require a revolutionary procurement strategy. Sometimes savings come from disciplined follow-through, better data, clearer accountability, and ensuring that fielded units actually implement approved corrective actions.
For federal contractors, the report is also instructive. Sustainment is not merely a government budgeting issue; it is a contracting, data, maintenance, software, logistics, and performance-management issue. Contractors supporting defense systems should expect increasing scrutiny of cost drivers, reliability improvements, repair turnaround times, technical data, software updates, and product-support strategies. The companies that can credibly help agencies reduce life-cycle costs, not merely deliver systems, will be better positioned in a defense environment increasingly focused on readiness, affordability, and measurable sustainment outcomes.
Disclaimer:
This article is for general informational purposes only and does not constitute legal, accounting, procurement, or professional advice. Readers should consult qualified advisors regarding specific federal contracting, acquisition, or compliance matters.