On November 11, 1960, Capt. Gregorio S. Oca, concerned with the plight of the licensed crew of United President Lines, Magsaysay Lines, Inc. and the Eastern Shipping Lines, constituted the Associated Marine Officers’ Union of the Philippines (AMOUP), with the PTGWO as the mother organization. At the same time, Bro. Donato Alarcon organized the unlicensed crew and formed the Associated Seamen’s Union of the Philippines (ASUP). The members then working on board foreign vessels, receiving very low salaries and wages, with poor working conditions, and often not covered by necessary benefits and unprotected from accidents, sickness and death. With aims and objectives to unite all Filipino seafarers, Capt. Oca labored to fight for the social, legal and moral rights of the members in the domestic and foreign fronts. He wanted free, if not, affordable medical and dental services, sufficient education and adequate training, and a united organization with clear, definite and willful objectives. Guided by the same ideals and principles, the two (2) unions decided to merge into one cohesive organization in 1972 and named it the Associated Marine Officers’ and Seamen’s Union of the Philippines (AMOSUP-PTGWO). As early as its inception, AMOSUP affiliated itself with the International Transport Workers’ Federation (ITF).