The Marines (海軍 Kaigun) are the World Government's military sea force, and collectively serve as one of the longest-running antagonists of the series, alongside the Baroque Works, CP9, and Blackbeard Pirates. They are present in all the seas around the world, although they maintain only a slight military presence in the four Blues by establishing branch offices. The focus of the bulk of their assets is on the far more dangerous Grand Line, as their main headquarters, Marineford, is located there. The Marine HQ was situated at Marineford, but after the time skip, it is situated in the New World.
The Portrait Of Pirates Versions:
(Bellemère*: If you consider it as an EX-Marine)