In the year 1510 of the Sea Circle Calendar, the Supreme Military Conference held by the Marines at Marineford became a milestone that marked the turning of an era.
Under Fleet Admiral Sengoku's leadership, the conference formally passed the "New World Strategic Jurisdiction and G-10 Base Administrative Autonomy Act."
Marine Headquarters Admiral "White Kirin" Gern Reginald Sigma was officially appointed to concurrently serve as the Marines' supreme strategic commander in the New World.
G-10 Marine Base and its sphere of influence were granted extensive autonomy in administration, finance, and military deployment, with coordination with Headquarters required only on diplomatic matters and major issues of principle.
A new dual-core strategic structure was established: "Marineford governs the first half of the Grand Line, Paradise, and the Four Blues, while G-10 oversees the New World."
From that point onward, the Marines officially entered a new era of "one body, two systems."
Headquarters and G-10 became the Marines' two wings, each bearing clearly defined strategic responsibilities, marking a profound transformation in both the projection of Marine power and their internal governance.
The following year, 1511, a succession of events in the New World shook the seas.
The nation of music, Elegia, was destroyed by the rapidly rising Red Hair Pirates.
Their captain, Red-Haired Shanks, became renowned worldwide for his formidable strength and was regarded as a new contender for the title of Emperor of the Sea.
Before long, however, the Red Hair Pirates came under relentless pursuit by one of G-10 Base's core fighters, "Hawk-Eye" Dracule Mihawk.
The Red Hair Pirates therefore made a strategic decision to withdraw from the New World.
After entering the first half of the Grand Line, they attacked a World Government transport ship and seized the Gum-Gum Fruit aboard it.
Shanks subsequently stayed in Foosha Village in the East