The U.S. Government Accountability Office (GAO) sustained BAE Systems’ protest of the Next Generation Jammer (NGJ) contract award, referring back the procurement to the U.S. Navy. In July, the Naval Air Systems Command awarded Raytheon a $279 million contract for the technology development phase of the future jamming system.

BAE Systems announced on July 18 that it had filed a protest with the GAO, challenging the contract award. “We protested the award based on concerns with the Navy’s evaluation of our offering and we are pleased that the GAO has sustained our protest,” the company said in a statement on Wednesday. “We look forward to working with the Navy to ensure a fair and open evaluation of our proposal for this important program.”

In its decision, the GAO said the Navy failed to reasonably evaluate technical risk of the NGJ proposals, failed to adequately document its evaluation and improperly credited Raytheon with outdated performance data, Reuters reported.

The NGJ will succeed the ALQ-99 tactical jamming system on the Navy’s EA-18G Growler electronic warfare aircraft. The Navy’s goal is to field the NGJ on the Growler in Fiscal Year 2020. The GAO has estimated the program’s overall value at $7 billion.