Diokno's nationalist legacy made further headlines when on February 12, 1983, former Supreme Court Justice J.B.L. Reyes, UP President Salvador P. Lopez, and former senators Tañada and Diokno formed the Anti-Bases Coalition (ABC), with Diokno voted as the secretary general or the chairman of the coalition. The influence of the ABC eventually led to the end of American military presence in the Philippines, notably in Subic Bay and Clark, Pampanga. The historic turnover ceremony transpired on November 24, 1992 under then-Philippine President Fidel Ramos.