But Lockheed executives recently announced that the full, combat-ready version of the upgrade is done, and they're just waiting for formal approval from the JPO. The government had been withholding $5 million per jet from Lockheed until the full upgrade package was ready. That figure was reduced to $1.2 million per jet earlier this year, after Lockheed made progress on TR-3 development. Still, the "bulk of funds" are being withheld from Lockheed, the JPO said, for the parked jets as well as the new production jets that are waiting for the full TR-3 upgrade. The money will be released "incrementally," and the program office expects the final withheld payment will be given to Lockheed next year. "The F-35 Joint Program Office is focused on overcoming known risks to deliver TR-3 combat capability in 2025. Many new capabilities will be delivered this year and into the future," the JPO said in a statement.