Apparently the M.P.'s are cracking down on Marines stationed on Okinawa doing their best Need For Speed: Underground imitations with real cars.
From Stars & Stripes, "'The most popular cars are Nissan Skylines and Toyota Supras — lightweight sports cars with manual transmissions,' the master sergeant said. 'On the busiest night we were out, there was a good-sized crowd, maybe a third of them Americans — 16 vehicles with Y-plates and 73 spectators.' Most apparently got the message that the MPs were on their case. On a recent Sunday, not a Y-plated car or American was to be found at the high-speed skids that showered spectators with atomized rubber. A few cars twirled out of control, coming to a stop just inches from parked cars. They recovered and quickly sped back on the course."