G-1 is a Marine base now standing on Paradise's Marineford, the former site of Marine Headquarters. It is commanded by Vice Admiral Momonga, having traded places with the central command in a relocation that followed the Summit War of Marineford.
G-1 is a Marine installation that once sat in the New World and now occupies Marineford on the Paradise side, the previous home of Marine Headquarters. Vice Admiral Momonga commands the base.
In the wake of the Summit War of Marineford, G-1 swapped places with Marine Headquarters. Fleet Admiral Sakazuki wanted the central command planted in the same waters as the Four Emperors so the Marines could contest their grip on the second half of the Grand Line. The base's old position, since renamed New Marineford, is described as a perfect mirror of Marineford on the opposite side of the Red Line.
Vice Admiral Momonga serves as base commander, supported by Lieutenant Zotto and Lieutenant Junior Grade Stalker.

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G-1 is a Marine base that now stands at Marineford on the Paradise side of the Red Line, having swapped places with Marine Headquarters after the Summit War of Marineford. It is commanded by Vice Admiral Momonga.
G-1 sits in Paradise at the site of the former Marine Headquarters, after the base traded locations with Headquarters, which moved to what is now called New Marineford in the New World.
G-1 is commanded by Vice Admiral Momonga, supported by Lieutenant Zotto and Lieutenant Junior Grade Stalker.
Fleet Admiral Sakazuki ordered the swap so Marine Headquarters would sit in the same waters as the Four Emperors, letting the Marines more directly contest their hold on the second half of the Grand Line.
G-1 first appeared in Chapter 598 of the manga and Episode 517 of the anime.
Looking for more on G-1? The One Piece Wiki on Fandom has a dedicated page with community notes.
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