Holding sway over the Grand Line, Marine Headquarters is the top tier of the Marine organization and counts as one of the world's Three Great Powers. Its command once sat at Marineford in Paradise before Sakazuki moved it out into the New World, to New Marineford.
This central division of the Marines governs the Grand Line and ranks among the Three Great Powers, sharing that tier with the Four Emperors and, until the SSG's Seraphim took their place, the Sea's Seven Warlords. Anyone posted here counts as a super-elite; a soldier's title at any lesser base is figured to fall roughly three grades short of the same title at the top. Leadership currently operates from New Marineford, seated out in the New World, a relocation carried out under Sakazuki, whereas the original seat lay at Marineford in Paradise.
The former Marineford site was a fortress-shaped stronghold crowned by a tall pagoda-style tower, fronted by a town where officers' families lived and by the Oris Plaza with its execution scaffold; that crescent island could be reached only through the Gates of Justice. Its replacement, raised where the old G-1 base had stood close to the Red Line, towers over the original, wears heavier fortifications and huge side arches, and drifts in Sabaody-like bubbles. Beneath the leadership stretches a web of lettered branch bases across the Grand Line, running from G-1 through G-5 plus G-9 and G-14, joined by the non-canon G-8 and G-F. Usually swamped by Grand Line duties and unable to police the four Blues, the command still intervenes when a matter turns grave enough, as it did in loosing a Buster Call upon Ohara.
For no fewer than twenty-four years the supreme command sat at Marineford, which weathered an early assault by Shiki. Roughly two decades later, Portgas D. Ace was seized and condemned to death, drawing Whitebeard's fury and igniting the Summit War of Marineford; the Marines claimed victory, though the island suffered heavy ruin. Once installed as Fleet Admiral, Sakazuki swapped the sites of the top command and G-1, shifting operations to New Marineford, where he wrestled with the Luffy-Law alliance and with the Levely. In a later scene, Sengoku and Tsuru read there of T Bone's murder and fretted over the Cross Guild's bounties placed on Marines.

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The main strength of the Marines gathers at Marine Headquarters on the Grand Line, though the organization also maintains many lettered branch bases spread across every sea.
Marine Headquarters currently sits at New Marineford in the New World, having been relocated there by Fleet Admiral Sakazuki from its original site at Marineford in Paradise.
Marineford was the original seat of Marine Headquarters, the Navy's top command, until Sakazuki moved the headquarters to New Marineford after becoming fleet admiral.
The original Marineford was a fortress shaped stronghold topped by a pagoda style tower, fronted by an officers' town and the Oris Plaza execution scaffold, and reachable only through the Gates of Justice.
Marine Headquarters was the site of the Summit War of Marineford, fought after Portgas D. Ace was captured and sentenced to death, a battle the Marines won but which left the island heavily damaged.
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