The promised Futenma closure was conditioned on building another Okinawa base

Evidence

But when the U.S. and Japanese governments signed their 1996 agreement, there was a catch: the military wouldn’t close Futenma until the Japanese government built the Marines a new base. And although most Okinawans expected the replacement would be outside their prefecture, the two governments selected a site on Okinawa’s east coast, near an existing base called Camp Schwab. — David Vine, Base Nation_ How U.S. Military Bases…, 853

Categorization

• corroborated: 2 independent passages support this claim — David Vine, Base Nation_ How U.S. Military Bases…, 853