Big Boss, bearded and hard-eyed, in a long coat and gloves; behind him, helicopters in flight over a burning sky and a large disc bearing the peace symbol.
MSF // TERMINALCaribbean Sector · 1974

Metal Gear SolidPeace Walker

Release

August 27, 2026

METAL GEAR SOLID: MASTER COLLECTION Vol. 2

BRIEFINGBackground to the operation
OPS-011974

THE ISTHMUS AS A BOARD

Central America works as a secondary board of the Cold War. Washington and Moscow do not fight there head on: they delegate. Fragile governments and porous borders leave zones with no settled authority, and in that margin operate units that answer to no state. Their orders go unsigned. No one is obliged to acknowledge them.

Dirt street in a Central American village, houses with ochre walls and a wooden watchtower at the far end; below, a watercolor study of the same building.
OPS-021974

CONTACT IN COLOMBIA

Kazuhira Miller works his way across the continent until he finds Snake in Colombia. He does not arrive with an ordinary contract. He brings a call for help from Costa Rica, a country that dissolved its army in 1948 and now records foreign troops without insignia inside its borders. Nobody claims those units. Nobody recalls inviting them.

Atmospheric painting of a wooden structure on stilts at the water's edge, under an overcast sky that fills most of the plate.
OPS-031974

AN ARMY WITHOUT A FLAG

Out of that meeting comes an organization with no nation and no flag. Militaires Sans Frontières funds itself by contract, chooses where it intervenes and answers to no government. Its headquarters does not stand on land either: Mother Base rises as an offshore platform in the Caribbean, outside recognized jurisdiction. Whoever signs on leaves behind the uniform he arrived in.

Night view from above of an offshore platform built from hexagonal modules joined by walkways; below, separate diagrams of the support structures.
OPS-041974

DETERRENCE WITHOUT AN OPERATOR

Reconnaissance in the jungle points to a nuclear deterrence program that does away with the human operator: a machine cleared to order a launch on its own. The recovered material also carries a voice attributed to The Boss, the instructor Snake had counted as dead since 1964. From that point on, the work stops being a contract.

Four-legged war machine with a single red optical eye and cylindrical canisters along its back, standing on jointed legs; below, two variants of the same design in red and gray.
MAPArea of operations

Chart of the Caribbean sector

Campaign plot over the isthmus. Mother Base lies offshore, and the links to every zone run from it. Select a marker to read its report.

Schematic chart of the Central American isthmus and the Caribbean Sea with the zones of operation markedCaribbean SeaPacific OceanNicaraguaCosta RicaPanamaColombia84° W80° W76° W72° W19° N16° N13° N10° N7° NN0200400 kmLegendRegistered zoneActive zoneLink to Mother BaseZO-01ZO-02ZO-03ZO-04ZO-05
Night view from above of an offshore platform built from hexagonal modules joined by walkways; below, separate diagrams of the support structures.
MB-00Caribbean Sea · international waters

Mother Base

Mother Base stands on pilings outside territorial waters. Hexagonal modules are joined by catwalks and the structure grows by accretion: another platform goes up once the personnel no longer fit. Every team ships out from here, and everything recovered in the field comes back here.

Reconnaissance report · Caribbean sector · 1974

BASEMother Base

The platform

Militaires Sans Frontières answers to no country, so its territory is a refitted offshore platform in Caribbean waters. Each deck belongs to a unit, and the units reach one another by catwalk and by radio. Pick a marker to review the sector.

Aerial view of Mother Base: hexagonal decks joined by catwalks over the sea, with a control tower at the center and a landing strip off to the left.

Aerial view · six sectors on record

PL-01Sector on screen

Command

Mother Base's command post. Deployments are coordinated from the tower, contracts are approved there, and every mission is tracked by radio. It holds the link to the field and decides which job is taken and which is turned down.

In chargeBig Boss
Post
Control tower
Comms
Open radio to the field
Personnel
Small and fixed
PERSONNELMother Base registry

Personnel files

Files opened during the 1974 operation: those who signed with Militaires Sans Frontières, and those who crossed its path on the isthmus.

  • Close-up portrait of Big Boss: beard, green beret with the MSF emblem and a black patch over his right eye.
    MSF-001Snake

    Big Boss

    MSF commander

    Founder and commanding officer of Militaires Sans Frontières. He served in a regular army before that, and trained under The Boss. Retirement never quite took. He signs the Costa Rica contract with reservations and ends up running the whole operation out of Mother Base. Given the choice, he takes the field over the command room.

  • Full-length close view of Kazuhira Miller, with aviator sunglasses, blond hair and a yellow bandana over an olive drab uniform.
    MSF-002Kaz

    Kazuhira Miller

    Deputy commander and operations chief

    Second-in-command of MSF and the reason the outfit stays solvent. He was the one who traveled to Colombia to find Snake and put the contract on the table. He runs the money and the recruiting from Mother Base. He talks about war in market terms, and rarely passes up a chance to mention what each bullet costs.

  • Full-length close view of Paz Ortega Andrade in a blue school uniform, red ribbon tie and rubber boots.
    MSF-014

    Paz Ortega Andrade

    Costa Rican student

    A high school student in Costa Rica. She enters the initial report as a witness to the unmarked troops, and comes into MSF custody after the first deployment. She talks about peace without irony and holds to it with a stubbornness the rest of the staff finds hard to place. Seen around the Mother Base walkways with a soccer ball.

  • Full-length close view of Amanda Valenciano Libre in a dark shirt, with a yellow bandana at her neck and fatigue trousers.
    EXT-021

    Amanda Valenciano Libre

    Guerrilla commander in Nicaragua

    Commander of a Sandinista cell in Nicaragua. She runs her people hard and distrusts any foreign force that shows up offering help, MSF included. She negotiates weapons and support with Miller grudgingly. A leg wound from an earlier fight never healed all the way. Her younger brother fights in the same unit, and that is where she is soft.

  • Full-length close view of Chico in a field cap, yellow bandana and olive drab uniform, giving a military salute.
    EXT-022

    Chico

    Fighter in the Sandinista cell

    Amanda's younger brother and the youngest in the cell. He wants to be treated as a fighter like any other, and goes off on his own to prove it. He knows the jungle and the ruins better than anyone in his unit, and that edge pushes him into risks nobody asked him to take. He admired Snake before they ever met.

  • Close view of Huey Emmerich seated in his powered wheelchair, with round glasses, long hair and a light shirt with an ID badge.
    MSF-031

    Huey Emmerich

    Head of research and development

    An engineer specialized in bipedal locomotion systems. He worked on an American weapons project before landing at Mother Base, where he takes charge of MSF's own development work. He uses a wheelchair, and he describes his machines with an enthusiasm that skips past what they will be used for. Technology is neutral, he argues; responsibility belongs to someone else.

  • Full-length close view of Strangelove with short gray hair, dark glasses, a black vest, white shirt and tie.
    EXT-041

    Strangelove

    Artificial intelligence scientist

    British scientist in charge of the project's artificial intelligence system. She comes out of an earlier military research program and works with a discipline her own superiors call uncomfortable. She says little about herself and answers personal questions with technical detail. Let the conversation reach The Boss, though, and she will not let the subject go.

  • Full-length close view of Cécile Cosima Caminades in a headband, khaki shirt and shorts, and hiking boots.
    MSF-037

    Cécile Cosima Caminades

    Civilian witness to the incident

    A French birdwatcher. She traveled to Costa Rica on her own and was the first civilian to see the weapon operating in the jungle. Her statement is where the contract begins. She ended up under MSF protection, more put out by the interruption to her trip than frightened by what she saw.

  • Full-length close view of Vladimir Zadornov in a long brown coat and dark suit, with a red glove on his right hand.
    EXT-050

    Vladimir Zadornov

    Soviet officer in command

    Soviet officer identified as commanding the unmarked troops deployed in Costa Rica. He carries himself with the calm of a man who has an institution behind him, and he answers questions with riddles. He is the first name MSF manages to put on the board. Everything known about him comes from his own account of events.

  • Full-length close view of Hot Coldman: bald, in a gray shirt with tie, suspenders and a red pocket square.
    EXT-061

    Hot Coldman

    Senior CIA official

    A career CIA officer, from the generation that built the agency up after the war. He directs the deterrence program MSF is investigating in the jungle. He defends the work with desk logic: a threat is useful as long as it is believed. He never sets foot in the field; what happens there reaches him as figures in a report.

ROSTERMother Base personnel

Roster

Complement on the books

350

Every soldier taken out of the isthmus passes through the register and is given a code and a code name. The wall shows 48 of the open files; the rest stay in the platform's internal archive.

Breakdown by unit

  • Combat25

    Deploys across the isthmus and holds the Mother Base perimeter.

  • R&D08

    Builds and adapts the weapons and equipment the operation runs on.

  • Supply06

    Handles ammunition, rations, fuel and the supply routes.

  • Intelligence06

    Works the sector's radio traffic and writes the pre-sortie report.

  • Medical03

    Treats the wounded, runs the infirmary and decides who goes back out.

Portraits of anonymous Mother Base personnel. Illustrations by Yoji Shinkawa · Konami. The codes, code names and unit assignments are invented for this site.

RECONAI weapons
Optics activeAutonomous targeting system

The machines of the project

Files drawn from the reconnaissance material. Every unit carries the same control module, and none of them needs an operator to open fire.

Squat war machine in gray and red armor, resting on four limbs that end in tracks; a dark cylinder sits on its back alongside two cannons pointed forward.
AI-01

Pupa

Autonomous AI weapon, tracked chassis

The first unit of the program to turn up in field reconnaissance. It moves on tracks mounted to articulated limbs and keeps the chassis low to the ground. The forward cannons and the cylindrical module raised over its back fix the silhouette. Closer to a mobile artillery piece than to a walker.

Locomotion
Tracks on articulated limbs
Crew
Unmanned
Role
Advance unit
Origin
AI weapons program
Flying craft with two large disc rotors tilted on articulated arms; a dark cylinder and a long launcher on a rail hang from the central body.
AI-02

Chrysalis

Autonomous AI weapon, aerial platform

The program's air unit. Two disc rotors on tilting arms hold it aloft and let it bank without turning the fuselage. A rail-mounted launcher and the cylindrical control module hang underneath. Seen from the ground, its disc profile matches the sightings that filled the newspapers in those years.

Locomotion
Flight on tilting rotors
Crew
Unmanned
Role
Airspace control
Armament
Ventral launcher on a rail
Large armored vehicle on several track assemblies, with smaller turrets spread across the hull and an articulated arm folded on the roof; below, the same machine in a red version.
AI-03

Cocoon

Autonomous AI weapon, heavy platform

The largest ground platform in the program. An armored hull rides on several track assemblies, with turrets spread along the flanks and an articulated arm folded on top. It advances in a straight line and denies ground by volume of fire. Work it from under its firing arc, where the turrets cannot reach.

Locomotion
Multiple track assemblies
Crew
Unmanned
Role
Assault and area denial
Feature
Articulated arm on the hull

Peace Walker

Autonomous AI weapon, quadruped walker

The unit the project is named for. It walks on four legs and can rise onto the rear pair for height and a better firing angle. A spherical sensor carries its read of the field; the cannon on its back carries the damage. It is built to operate with no crew and no human signature on the decision to fire.

Locomotion
Quadruped, with upright stance
Crew
Unmanned
Sensor
Forward spherical optic
Role
Head of the program
Quadruped machine with articulated legs, an orange-glowing spherical sensor at the front and a long cannon over its back; below, the same unit standing upright on its hind legs.
AI-04

Metal Gear ZEKE

Crewed bipedal Metal Gear

The project Militaires Sans Frontières built for itself. Bipedal, with a railgun mounted at the shoulder and a radome on its back. It is assembled at Mother Base from parts recovered in the field, so its configuration and its paint change with whatever the depot holds. Unlike the AI machines, it has a cockpit.

Locomotion
Bipedal
Crew
Crewed, with cockpit
Armament
Shoulder-mounted railgun
Origin
Assembled at Mother Base
Bipedal Metal Gear seen in profile, leaning forward, with a long railgun over its shoulder, a circular radome on its back and feet ending in yellow claws.
MG-01
Study sheet of a cylindrical module: plan and profile views, top hatch, sensor eyes at the front and exploded details of the base mounting next to a human figure for scale.
SYS-01

AI Pod

Control module common to the series

The cylindrical module that repeats across every machine in the program. It houses the control system and keeps interior room for one person, with a working hatch, sensor eyes and a data connector at the base. It also reads as a marker: where that cylinder appears, the unit carrying it answers to no pilot.

Format
Cylindrical module
Function
Control core
Access
Working hatch
Distribution
Common to the whole series
INTELReturn confirmed

METAL GEAR SOLID: MASTER COLLECTION Vol. 2

August 27, 2026

Contents

  • Metal Gear Solid 4: Guns of the Patriots

    First port since its original 2008 release

  • Metal Gear Solid: Peace Walker

    HD version, with online play for up to six players and no crossplay

  • Metal Gear: Ghost Babel

    Bonus title. Adds screen filters and a rewind function

  • Screenplay book

    Full script of both main titles

  • Master book

    Story and character files

  • Digital soundtrack Vol. 2

    Instrumental and vocal tracks from the series

  • Series database

    Encyclopedia with a timeline and a character relationship chart

Platforms

  • Nintendo Switch 2
  • Nintendo Switch
  • PlayStation 5
  • Xbox Series X|S
  • Steam

Preorder bonus

  • Cardboard Camouflage

    Uniform for Metal Gear Solid 4

  • Love Cardboard

    Uniform for Metal Gear Solid: Peace Walker

Konami's official announcement ↗
ARCHIVEArt works

Shinkawa's brushwork

A selection from the game's official art book: characters, mechs and vehicles brushed by Yoji Shinkawa.

See all 52 plates

Illustrations by Yoji Shinkawa. Metal Gear Solid: Peace Walker Official Art Works (SE-MOOK, Square Enix). © Konami Digital Entertainment.

TAPESTape library

The soundtrack

Sixteen tapes from the Peace Walker catalog, each with its composer, its running time and a note on where the track turns up. Pick a tape to load it into the deck.

C-01Entry only
A

Metal Gear Solid Peace Walker Main Theme

Akihiro Honda

Main theme. It plays over the opening and sets the tone of the Central American operation before Militaires Sans Frontières sends out its first deployment.

Audio not hosted · running time 2:56

Listen at the official source

16 tapes on file

The music of Peace Walker is the work of Konami and is not hosted on this site: the digital soundtrack is included with METAL GEAR SOLID: MASTER COLLECTION Vol. 2, and the original disc remains on sale. What you find here is the entry for each track and the link to the source.