Pappas was born in Kymi on 21 June 1930. He entered the Hellenic Naval Academy in September 1948, and graduated on 7 April 1952 as an Ensign. He served as commander of the minesweepers Salaminia and Kalymnos, being promoted to Second Lieutenant on 11 April 1955. He then commanded the hydrographic survey ship Vegas, before being sent to Britain in 1958–59 to attend the British Royal Navy's Navigation School. On his return, he was promoted to Lieutenant, and assumed command of the gunboats Arslanoglou and Pezopoulos. In 1963–65 he was adjutant to the Minister for National Defence. Promoted to Lieutenant Commander on 11 June 1965, he commanded the LSTLesvos in 1965–67 and the destroyer Leon in 1967–68. In the latter capacity he received a commendation from the Chief of the Hellenic Navy General Staff and the Minister for Mercantile Marine for his role, despite extremely difficult weather conditions, in the rescue of the crew of the steamer Stratoniki, which sank on 7 September 1967. In 1968 he graduated from the Navy War School and was promoted to Commander on 4 September 1968. In 1968–69 he served as Chief of the B1 Bureau of the Hellenic Navy General Staff, then until 1971 he headed the Navy Command's 5th and 3rd Staff Bureaux. In 1971 he graduated from the NATO Defense College, and in 1971–72 he headed the Navy's Training Centre at Poros and the Naval NCO Academy. In 1972 Pappas assumed command of the destroyer, with which he participated in the abortive Navy revolt, planned for 25 May 1973, against the then-ruling military junta. Although the revolt was pre-empted by the junta, Pappas led his own vessel, the destroyer Velos, to Italy, where he and 31 of the ship's officers and NCOs requested political asylum, and gave a press conference in front of the international media where he denounced the regime. In retaliation, the regime dismissed him from the Navy and stripped him of his citizenship. After the fall of the junta in 1974, Pappas was reinstated in his rank and was promoted to captain. He served as chief of the Administration Command of the Salamis Naval Base until 1976. He then went to London as defence attaché until 1979, and returned to assume command of the Fast Attack Craft Flotilla. Promoted to commodore on 20 December 1979, he then assumed command of the Destroyers Command, was promoted to rear admiral and was appointed head of the Naval Training Command. On 23 March 1982 he was promoted to vice admiral and named as Chief of the Navy General Staff, a post which he retained until his retirement as a full admiral and honorary chief of the HNGS on 22 December 1986. During the political crisis of 1989–90, he served as Minister for Mercantile Marine in the caretaker government of Ioannis Grivas and the national unity government of Xenophon Zolotas. Pappas died at his residence in Athens, following a battle with cancer, on 5 April 2013. He was married and had two sons, Velisarios and Panayiotis Pappas.
Honours
Admiral Pappas had received the following Greek and foreign decorations:
