The Pentagon grounded its very expensive and very problematic F-35 fleet over the weekend due to an apparent engine oil leak. Within a day or so, the military inspected all 104 of the jets, three of which did not pass the tests. The rest are now back in the air.
This sort of thing happens with unreasonable frequency. By our latest count, this is the seventh time the entire fleet's been grounded, but it could be even more. It's hard to keep track since this happens all the time. This time is extra embarrassing for the military, not to mention the jet manufacturer Lockheed Martin, because the incident affected one of the new F-35B Joint Strike Fighters, a variant scheduled to make its big international debut on July 4. It's also supposed to be the first F-35 jet declared to be combat ready. It does not seem particularly combat ready.