At the close of 2018, it seemed that 2019 might finally be the year Lockheed Martin’s flagship F-35 Joint Strike Fighter would start beating back the critics and proving the most expensive weapons platform in history was worth the cost and delays. With F-35s finally entering the fight with both the Israeli military and the U.S. Marines before the onset of 2019, the days of the most advanced fighter on the planet serving as little more than a technology demonstrator are finally behind us, but the F-35’s problems persist.

According to a report issued by the Office of Operational Testing and Evaluation, fewer than 60% of F-35s delivered to the United States are operational, meaning, there has been no readiness improvement over previous years despite new readiness efforts being mounted.

“There was no improving trend in fleet aircraft availability. Fleet-wide average availability is below program target value of 60 percent and well below planned 80 percent needed for efficient conduct of IOT&E,” the report says. “The trend in fleet availability has been flat over the past three years; the program’s reliability improvement initiatives are still not translating into improved availability.”

Although acknowledging that more than 40% of all delivered F-35s won’t fly anytime soon is bad, some could contend another glaring issue in the report is far more damning of the multi-role fighter that is expected to replace long-serving platforms as diverse as the F-16 Fighting Falcon and A-10 Thunderbolt: it’s close air support gun doesn’t seem to be very good.