The 1972 reversion actually increased Okinawa’s share of US bases.

Evidence

In 1962, the Okinawan legislature passed a unanimous resolution condemning the United States for engaging in colonial rule, and by 1968, 85 percent of Okinawan and Japanese survey respondents favored the immediate return of Okinawa. Eventually, Prime Minister Eisaku Sato and President Richard Nixon negotiated the return of Okinawa to Japanese rule by 1972. However, the actual base land to be returned was minimal. The proportion of U.S. bases in Okinawa as opposed to the rest of Japan would actually increase. — David Vine, Base Nation_ How U.S. Military Bases…, 849

Categorization

• SEED: Angle for an essay: nominal decolonization that leaves the underlying base burden intact — how formal sovereignty changes obscure real power.
• corroborated: 2 independent passages support this claim — David Vine, Base Nation_ How U.S. Military Bases…, 849