Why the Government Loses Protests & What You Must Do Now

The Persistent Shadow of Sustained Protests

Bid protests get a lot of attention, but the numbers are smaller than the headlines suggest. The Government Accountability Office (GAO) received 1,688 protest cases in FY2025, down 6% from FY2024, and it sustained 53 of the 380 protests it decided on the merits, a 14% sustain rate (GAO's FY2025 bid protest report to Congress). A sustain is still no mere administrative hurdle. It means GAO found that the agency broke a procurement rule in a way that hurt the protester, and GAO usually recommends corrective action such as a new evaluation.

The "so what" here is profound: sustained protests don't just delay contracts; they delay critical warfighting capabilities, inflate costs, and erode trust in the acquisition process. For both government and industry, understanding why these protests succeed is the first step toward preventing them.

The Core Problem: Why Agencies Trip Up

Each year GAO's report to Congress lists the most common reasons it sustained protests. In FY2023 and FY2024 the top three were unreasonable technical evaluation, flawed selection decisions, and unreasonable cost or price evaluation (GAO FY2023 report). In FY2025 they were unreasonable technical evaluation, unreasonable cost or price evaluation, and unreasonable rejection of a proposal. None of these are esoteric legal arguments. They're basic breakdowns in the process:

• Unreasonable Technical Evaluation: Number one on GAO's list in each of the last three years. Agencies fail to assess proposals according to their own stated criteria. This can manifest as arbitrary downgrades, inconsistent application of evaluation standards, or a failure to recognize innovative approaches that meet requirements.
• Flawed Selection Decision and Thin Documentation: A top-three reason in FY2023 and FY2024. If the agency's record doesn't clearly, comprehensively, and contemporaneously explain why certain decisions were made (why one offeror was chosen over another, or why a proposal received a particular rating), GAO will likely find it indefensible.
• Unreasonable Cost or Price Evaluation: Number two in FY2025. Especially in complex services or development contracts, agencies sometimes accept unrealistically low proposed costs without sufficiently scrutinizing them. If an awardee's price seems too good to be true, and the agency can't justify its realism analysis, it’s a prime protest target.
• Unreasonable Rejection of a Proposal: New to the top three in FY2025. Agencies get into trouble when they throw out a proposal for breaking a rule the solicitation never clearly stated. Unequal treatment is the close cousin here. Holding offerors to different standards, or giving one of them information the others didn't get, is another reliable way to lose.

The "so what" for agencies is clear: these are not minor procedural quibbles. They are systemic vulnerabilities that, when exposed, force significant rework and delay. For contractors, these are the battlegrounds where protests are most likely to succeed.

Real-World Impact: Case Studies & Costs

Here are three real sustains GAO highlighted in its FY2025 report, one for each of that year's top three reasons (GAO FY2025 bid protest report):

Sustains are only part of the story. GAO sustained 14% of its merit decisions in FY2025 and 16% in FY2024. But its "effectiveness rate", the share of cases where the protester got some relief, either because the agency took voluntary corrective action or because GAO sustained the protest, was 52% in both years. In other words, agencies often fix a problem before GAO ever rules. Either way, the costs add up:

• Program Delays: GAO has up to 100 days to decide a protest (GAO's bid protest process), and a timely protest usually triggers an automatic stay of award or performance. If GAO sustains, the corrective action (a new evaluation, new discussions, sometimes a new solicitation) adds more time.
• Direct Rework Costs: Re-evaluating proposals, reopening discussions, rewriting source selection documents, and paying for legal support all cost staff time and money, and the bill grows with the size of the buy.
• Contractor Costs: Protesting isn't free either. Outside counsel, staff time and months of uncertainty add up quickly, especially on complex protests.

The "so what" here is that these aren't just legal battles; they are expensive, time-consuming setbacks that directly impact our national security posture and taxpayer dollars.

What Agencies Must Do (and Why)

For DoD Program Managers and acquisition professionals, the path to avoiding sustained protests is clear, albeit demanding. It boils down to diligence, documentation, and proactive risk management:

• Rigor in Documentation is Paramount: If it's not documented, don't expect GAO to give you credit for it. Maintain a clear, comprehensive, and contemporaneous record of every decision, rationale, and discussion. This is your agency's best defense.
• Master Evaluation Methodologies: Ensure evaluation criteria are unambiguous and consistently applied. Train evaluators thoroughly on the solicitation's requirements and the perils of undocumented "gut feelings."
• Proactive Legal Engagement: Involve legal counsel early and often, especially for high-value or complex procurements. They can identify and mitigate protest risks before they escalate.
• Useful Debriefings: Provide thorough and meaningful debriefings to unsuccessful offerors. A clear understanding of the agency's decision can sometimes prevent a protest or narrow its scope.
• Risk Mitigation Planning: Integrate protest risk into your program schedules and budgets. Have contingency plans for potential delays or corrective actions.

The "so what" for government teams is that these actions aren't optional best practices; they are essential safeguards against mission-critical delays and wasteful expenditure. Getting it right upfront saves exponentially more time and money down the line.

What Contractors Must Do (and Why)

For defense contractors, the bid protest mechanism is a vital tool for ensuring fair competition. However, it requires strategic thinking and careful execution:

• Strategic Protest Decision-Making: Evaluate the merits of a potential protest carefully. A sustained protest is powerful, but frivolous filings damage relationships and consume significant resources. Focus on clear, demonstrable agency errors that prejudiced your offer.
• Thorough Proposal Preparation: Submit comprehensive, well-documented, and compliant proposals. The stronger your initial proposal, the clearer any agency evaluation errors will appear if you need to protest.
• Use Your Debriefing: Use the debriefing process to gain a clear understanding of the agency's evaluation. This information is critical for determining whether a protest has merit and for focusing your arguments.
• Understand Protest Grounds: Familiarize yourself with common protest grounds: evaluation errors, flawed solicitations, unequal treatment, cost realism issues. This knowledge helps you identify potential agency missteps when reviewing your debriefing.
• Focus on Specificity: When filing a protest, be specific about the alleged agency errors and how they prejudiced your offer. General complaints rarely succeed; a detailed, fact-based argument is key.

The "so what" for contractors is that strategic, well-founded protests are a legitimate and necessary part of a healthy acquisition ecosystem. They hold agencies accountable and ensure a level playing field, ultimately benefiting both industry and the warfighter by promoting better, fairer procurements.

Conclusion: A Shared Responsibility

The challenges of defense acquisition in 2025-2026 are immense, and the oversight provided by the GAO's bid protest function remains a critical check and balance. Sustained protests represent significant failures in the acquisition process, costing time, money, and potentially delaying vital capabilities.

For defense PMs and acquisition professionals, the message is unequivocal: rigorous planning, meticulous documentation, and consistent application of procurement law are non-negotiable. For contractors, understanding the rules and using the protest mechanism strategically is essential for ensuring fair competition and protecting their interests. Ultimately, improving acquisition outcomes and minimizing sustained protests is a shared responsibility, and it's essential to delivering on the nation's defense priorities.

Top Sustained Protest Grounds (GAO Annual Reports, FY2023–FY2025)