 The resulting failures in administration brought on a gradual decline of the Portuguese trade monopoly.In consideration of the challenging military situation faced by Portuguese forces worldwide, John III declared every male subject between 20 and 65 years old recruitable for military service on 7 August 1549.Among John III's many colonial governors in Asia were Vasco da Gama, Pedro Mascarenhas, Lopo Vaz de Sampaio, Nuno da Cunha, Estêvão da Gama, Martim Afonso de Sousa, João de Castro and Henrique de Meneses.