<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngo-1954 u-Oliva wamiswa njengelungu lesibili lebutho laseCuba ngemva kokuphothula esikoleni sezempi saseCuba, i-Cadet School. Ngemuva kokuphothula iziqu zakhe e-Artillery Academy ngo-1955 waqokwa njengoprofesa we-Artillery e-Cadet School kwaze kwaba ngo-1958. Kusukela ngo-1958 kuya ku-1959 wayengumfundi, futhi waphothula iziqu zakhe ngokuhlonishwa, futhi waba ngumfundisi e-US Army Caribbean School e-Canal Zone, ePanama  <response>: . futhi. Ngasekupheleni kuka-1959 ngemva kokuba i-Castro revolution iguqule uGeneral Batista, ibutho laseCuba lahlanzwa, kodwa u-Oliva wamiswa njengoMhloli Jikelele e-INRA. NgoMeyi 1960 wayeyingxenye yeqembu labesebekade bengabaphathi baseCuba ababehlela umkhankaso wokulwa nombuso kaCastro. Bonke babephothule esikoleni sezempi saseCuba. Washiya ibutho ekuqaleni kuka-August 1960 futhi wagibela indiza waya eMiami. Ngo-August 29, 1960, u-Oliva kanye nezithunjwa zaseCuba ezingaba ngu-40, ezaqashwa yi-Central Intelligence Agency zathuthwa ngendiza ye-CIA C-54 eya eSan José, eGuatemala ukuyokwenza ukuqeqeshwa kwama-guerrilla okwathi kamuva kwaba okuvamile. 