GINOWAN, Okinawa Pref. — In Japan, where land is a precious commodity, many U.S. bases boast golf courses, football fields and giant shopping malls whose food courts offer everything from Taco Bell to Subway to Starbucks.

They are the most visible point of grievance in a sharpening debate about the cost to Japan of supporting the 47,000 U.S. service members — about $2 billion a year. That's nearly a third of the total, and about three times what Germany pays to host U.S. forces there.

But facing economic woes and seeking a more equal relationship with the U.S., the Hatoyama administration is questioning whether Japan should spend so much on U.S. forces — a topic that was taboo under the pro-Washington Liberal Democratic Party administrations that governed for most of the postwar era.