SITORUS, Musa Hotmatua; SURYANTA, Apri; ADI, Sunarno. THE ROLE OF MENTAL DEVELOPMENT OF INDONESIAN NAVY’S FIRST FLEET TO INCREASE THE OPERATION READINESS OF THE NAVY OFFICER. Jurnal Pertahanan dan Bela Negara, [S. l.], v. 9, n. 3, p. 89–101, 2019. DOI: 10.33172/jpbh.v9i3.646. Disponível em: https://upgradeojs.rifqisyams.id/index.php/JPBH/article/view/646. Acesso em: 23 jul. 2026.