the central but still-unresolved dispute over moving the Futenma air base from a crowded part of Okinawa to a new site that has vexed relations for years
The Okinawans might want to think about being a bit more practical.
They must realize by now that China intends to start a war with Japan. And when that happens, they will want US fighter jets over Okinawa to shoot down Chinese warplanes and sink Chinese warships.
If they think they are going to rely on the US Air Force doing the job out of Kadena, they need to think again. The US Air Force uses planes that require a long runway without big craters in it, and China has a lot
of ordinance aimed at Kadena's runways.
So if they want US fighter jets protecting Okinawa during the war, they are going to need a Marine airbase on the island, because the Marines are the only branch of the US military that will be fielding a version of the F-35 that will actually be usable on Okinawa once China starts lobbing missiles.