After the application school on the Jeanne d'Arc, he was assigned from 1982 to 1984 on the patroller Altaïr then on the Amphibious disembarking transport ship Champlain, based at the Réunion.

He remained primarily in the zone around the Indian Ocean until his next posting as second commanding officer of the patroller Épée in Mayotte.

[2] In 1996, Prazuck integrated the Inter-arm Defense College (École de guerre), and became chief of the operations group (CGO) on board the anti-submarine frigate Tourville.

[2] In 2000, Prazuck joined the Information Service and Public Relations of the Armies (French: Service d'informations et de relations publiques des armées) – Marine (SIRPA – Marine) where he exercised the function of second in command, before assuming the lead role in 2001 for a period of three years.

[2] By a Ministerial Council (French: Conseil des ministers [fr]) Decree decision on 6 July 2016, Prazuck was designated as Chief of Staff of the French Navy (French: Chef d'état-major de la Marine, CEMM) and was elevated to the rank designation of amiral, as of 12 July,[3] by replacing Amiral Bernard Rogel, who had been promoted to Chief of the Military Staff of the President of the Republic (French: Chef d'État-Major du Président de la République [fr]).