He entered the Hellenic Army Academy in 1950, and graduated as an Infantry Second Lieutenant on 9 August 1953.[2][3] He was promoted to Lieutenant in 1956, Captain in 1960, Major in 1967, Lt. Colonel in 1975, Colonel in 1981, Brigadier in 1983, Major General in 1984, and Lt. General in 1986.[2] He attended infantry and parachutist courses in Greece, the U.S. Army Special Warfare School and the U.S. Army Anti-Tank Guided Missile School in West Germany (where he graduated with distinction), as well as the higher staff and command courses of the Superior War School and the National Defence School.[1][2]
He served as a field and staff officer in various units, including as instructor in the Infantry School, infantry battalion commander, special forces battalion commander, chief of staff of the 3rd Special Forces Division, infantry regiment commander, director of the 2nd Staff Bureau of the Hellenic Army General Staff, director of HAGS 1st Branch, commander of the 3rd Special Forces Division, commander of the ASDEN, and Army Inspector-General.[2][3]
On 5 July 1989 he was appointed Chief of the GES, and remained in the position until promoted to full general and appointed Chief of the Hellenic National Defence General Staff on 7 May 1990. He retired on 11 March 1993. From July 1991 to June 1992 he also served as chairman of the NATO Military Committee.[2][3] Amidst the climate of polarization between the socialist PASOK and the conservative New Democracy at the time, the decision of the conservative government under Konstantinos Mitsotakis to select Veryvakis, whose brother was a prominent PASOK politician, as head of the country's armed forces was widely commented at the time.
In addition to the usual Greek decorations for his rank and positions, he received the following foreign decorations: Commander of the Legion of Merit (USA), Commander of the Legion of Honour (France), and the Order of the Madara Horseman, First Class with Swords (Bulgaria).[3]
^ abcdef"Στρατηγός ΒΕΡΥΒΑΚΗΣ ΙΩΑΝΝΗΣ του ΔΗΜΗΤΡΙΟΥ, ΑΜ 32282.". Συνοπτική Ιστορία του Γενικού Επιτελείου Στρατού 1901–2001 [A Concise History of the Hellenic Army General Staff 1901–2001] (in Greek). Athens: Army History Directorate. 2001. p. 192.
§ Substitute Chiefs of the General Staff for the Rear Areas/Interior (as opposed to the Field Staff) † Deputy Chiefs substituting during vacancies ‡ Under the title "Chief of the Army"
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