taxpayers' money. The Okinawa secret pact is just the tip of the iceberg," the 75-year-old added.

Nishiyama failed to clear his name in March when the Tokyo District Court rejected his damages suit against the government in which he argued his career was ruined by an illegal conviction stemming from his scoop of the secret pact.

In February 2006, Bunroku Yoshino, a retired diplomat who negotiated with Washington on Okinawa's reversion as director general of the Foreign Ministry's then American Bureau, admitted to the existence of the secret pact.

Okinawa remained under U.S. control under the 1952 San Francisco peace treaty until it was returned to Japanese rule in May 1972.