The following is a detailed, in-depth timeline showing every single related event to ever take place, both in Metal Gear as well as the real world.
Beginning of the 20th century:
Reunion of the "Wisemen's Committee". Foundation of a group called "the Philosophers".
July 26th: Creation of the Bureau of Investigation (BOI), which would later be known as the Federal Bureau of Investigation (FBI).
August 12th: Major Zero is born.
July 28th: Beginning of the First World War.
November 11th: End of the First World War.
Date unknown: Founding of GRU by Vladimir Lenin.
Date unknown: John Edgar Hoover is appointed as Director of the BOI.
Date unknown: The Bureau of Investigation (BOI) is renamed to the Federal Bureau of Investigation (FBI).
May 15th: Tanya is born.
June 22nd: Para-Medic is born.
August: Albert Einstein writes a letter to President Roosevelt and requests the atomic bomb to be made.
September 1st: Beginning of the Second World War.
November 11th: Sigint is born.
November 30th: The Soviet army invades Finland, beginning the Winter War.
June 22nd: The "Great Patriotic War" begins with surprise attacks from German panzer armies, as the German army begins invading the Soviet Union.
July: The SAS ( Special Air Service ) of the British army is formed ("Who Dares, Wins").
December 7th: The Imperial Japanese Navy attacks Pearl Harbor.
August: The Manhattan Project is started. Otacon's grandfather is assigned to working on the project.
August 21st: The Germans besiege the city of Stalingrad.
December 2nd: Physicist Enrico Fermi splits an atom in a nuclear reactor for the very first time.
Date unknown: The Boss sets up the Cobra unit.
February 2nd: The Battle of Stalingrad is over. The Soviet army defeats the Germans.
June 6th (D-Day): The Boss gives birth in Normandy. Ocelot is born.
May 8th: End of the Second World War; beginning of the Cold War.
July 16th: The first nuclear test, code-named "Trinity", is conducted.
August 6th: Hiroshima is bombed. Otacon's father is born.
August 9th: Nagasaki is bombed.
September 2nd: Vietnam declares independence.
February 14th: ENIAC, the world's first computer, is unveiled.
September: The CIA ( Central Intelligence Agency ) is created.
October 14th: Pilot Chuck Yeager breaks the sound barrier in the Bell X1.
Date unknown: The Boss disbands the Cobra Unit.
April 4th: NATO ( North Atlantic Treaty Organisation ) is formed.
May: Germany is split up in East and West.
June 8th: George Orwell publishes the book 1984.
August 29th: The USSR tests their first nuclear bomb in Semipalatinsk, Kazachstan, and becomes the world's second nuclear force.
October 1st: The People's Republic of China is formed.
June 25th: Beginning of the Korean War.
Date unknown: Jack becomes a student of The Boss.
November 1st: The "Buster-Jangle Dog" nuclear test is conducted in Area 7 in Nevada, with U.S Army troops cooperating.
June: The NSA ( National Security Agency ) is formed.
Date unknown: Invention of the hydrogen bomb.
April 25th: Watson and Crick discover the double helix structure of DNA.
June 27th: End of the Korean War.
September 7th: Nikita Krushchev becomes the First Secretary of the Communist Party of the Soviet Union.
January: Secretary of State John Foster Dulles announces the New Look policy ( the so-called "massive retaliation strategy" ).
January 21st: The USS Nautilus, the first nuclear-powered submarine, is launched.
March 1st: The hydrogen bomb is tested in Bikini Atoll.
March 13th: The KGB ( Committee for State Security ) is formed.
March 13th until May 7th: The Battle of Dien Bien Phu.
November 3rd: The first Godzilla film is released in Japan.
April 18th: Albert Einstein dies, begging for the end of nuclear weapons.
August: The Soviet Union successfully launches the first intercontinental ballistic missile (ICBM), named R-7 Semyorka.
October 4th: USSR launch of Sputnik I.
February 1st: America launches its first sattelite, the Explorer I.
July 29th: The NASA is established. Work doesn't begin until October 1st.
January 1st: The Cuban Revolution.
October: Mordecai Roshwald publishes his book Level 7; a book about World War III.
October 6th: The Luna 3 takes pictures of the dark side of the moon.
December 17th: The American film "On The Beach" is released.
Date unknown: The Boss abandons Snake on a mission without any explanation.
May: The Southern Vietnamese NLF ( National Liberation Front ) is established.
May 1st: A Lockheed U-2 aircraft enters Soviet airspace. It is shot down and crashes near Sverdlovsk.
September: ADAM and EVA defect to the Soviet Union.
Date unknown: The Boss becomes the first person in space.
January 20th: John F. Kennedy becomes the President of the United States.
February: America conducts the first tests with the Minutemen ICBMs.
April 12th: The Vostok 1 is launched into space, making Yuri Gagarin the first human to officially travel into space.
April 15th until April 19th: Bay of Pigs Invasion.
May 5th: Alan Shepard becomes the first American astronaut.
June 22nd: The movie "The Guns of Navarone" is released.
August 10th: The Japanese film "The Last War" ( "Sekai daisenso" ) is released.
August 13th: The construction of the Berlin Wall is started.
September 21st: The American 5th Special Forces Group, the "Green Berets", is activated.
October 30th: The most powerful nuclear explosive, codenamed Ivan (and called "Tsar Bomba" (emperor of bombs) by the Western world), is detonated in Novaya Zemlya.
January: SEAL Team 1 is commissioned in the Pacific fleet and SEAL Team 2 is commissioned in the Atlantic fleet.
February 20th: The Mercury Atlas 6 ( Friendship 7 ) is launched, sending John Glenn into space. This is the first time an American travels in space.
October 5th: James Bond has his first role in "Dr. No".
October 14th until November 20th: Cuban Missile Crisis.
December 14th: The Mariner 2 approaches Venus and starts scanning the planet, revealing it has cool clouds and an extremely hot surface.
Date unknown: The Boss has a mission at Tselinoyarsk, being forced to kill The Sorrow, her former lover.
Date unknown: The United States begins production of the Davy Crockett nuclear missiles.
Date unknown: The SS-1C "Scud B" missiles, designed by Alexandr Granin, are deployed.
February: The United States and the Soviet Union sign the Hotline Agreement; A direct telephone connection is set up between the American and Soviet leaders.
July 4th: The film The Great Escape is released.
August 5th: The United States, Great Britain and the Soviet Union sign the Partial Test Ban Treaty ( PTBT ) in the Kremlin.
October 10th: The James Bond film "From Russia With Love" is released.
November 22nd: President Kennedy's assassination. Lyndon B. Johnson becomes the President of the United States.
Date unknown: John Le Carr publishes the book "The Spy Who Came in from the Cold".
July 2nd: President Johnson signs the Civil Rights Act.
August 2nd: The Gulf of Tonkin incident.
August 24th: Virtuous Mission. Naked Snake infiltrates Tselinoyarsk to rescue Sokolov. The Boss takes Sokolov and defects to the Soviet Union. The Virtuous Mission is a failure.
August 30th: Operation Snake Eater. Naked Snake infiltrates Tselinoyarsk yet again to rescue Sokolov, destroy the Shagohod, and eliminate the Cobra Unit, Colonel Volgin and The Boss.
September 2nd: Operation Snake Eater is a success. The Shagohod has been destroyed, the members of the Cobra Unit are dead. Colonel Volgin is fried by a bolt of lightning, and Naked Snake kills The Boss.
September: Naked Snake earns the title "Big Boss".
September 21st: The first test flight of the XB-70, a heavy bombing airplane which can fly at Mach 3 speeds.
October 12th: Three cosmonauts are sent into space aboard the Voskhod 1.
October 15th: Premier Kruschev leaves his position. Leonid Brezhnev becomes Party First Secretary.
October 16th: China successfully concludes its first tests of nuclear weaponry.
Date unknown: Sigint joins ARPA. He takes part in the development of ARPAnet, which would go online in 1969.
Date unknown: The U.S government conducts a study on emergency medical treatment. The Department of Transportation lays the groundwork for the creation of the EMT system.
Date unknown: Agent EVA disappears in Hanoi.
January 20th: President Nixon begins his term of office.
Date unknown: Para-Medic establishes the nation's first paramedic system in Seattle, Washington.
Date unknown: Major Zero disbands the FOX unit.
Date unknown: The United States receives the missing half of the Philosophers' Legacy. The American branch of the Philosophers is renamed to the "Patriots".
Date unknown: Big Boss establishes the FOX-HOUND unit.
June 17th: Beginning of the Watergate Scandal.
Date unknown: The Les Enfants Terribles project. Solid Snake, Liquid Snake, and Solidus Snake are born.
August 9: President Nixon resigns.
Date unknown: Big Boss battles in various African civil wars and becomes a hero.
Date unknown (Late 80's): Start of the first Liberian Civil War. Solidus kills Raiden's parents and takes in Raiden to use him to fight in said war as a child-soldier.
19th August: Formation of Vympel, a secretive Russian counter-terrorism unit. Raven later joins this group.
April: The Chernobyl accident showers the Romanenko family with radiation. Nastasha Romanenko vows the world to be free from nuclear weapons.
Date unknown: After losing her parents, Nastasha moves to the USA.
Date unknown: Liquid Snake, working for the SAS at the time, is sent into Iraq to destroy mobile SCUD missile launchers. During the mission he becomes a POW, and is declared MIA.
January 17th until February 27th: Gulf War. The American army injects their troops with a "Fight Gene", obtained when studying Big Boss. The side effects of these injections are disguised as "Gulf War Syndrome".
Date unknown: Nastasha Romanenko joins the DIA, where she meets Richard Ames, her future husband.
Date unknown: Liquid Snake is freed by the U.S government, and returns to the USA.
Date unknown: Solid Snake joins FOX-HOUND.
Date unknown: Outer Heaven crisis: Solid Snake defeats Big Boss and destroys Metal Gear TX-55.
Date unknown: FOX-HOUND second in command Roy Campbell is appointed commander-in-chief. Code name system is discarded.
Date unknown: Nastasha Romanenko leaves the DIA to become a freelance analyst, and starts writing for assorted information magazines, and US Naval magazines.
Date unknown: Nastasha attends the Canberra, the world's first nationally hosted nuclear weapon abolition proposal committee.
Date unknown: Nastasha joins NEST (Nuclear Emergency Search Team) as a military and nuclear analysist.
Date unknown: End of the first Liberian Civil War. Raiden, who at the time was interred at a relief center, is taken in by NGO's and sent to the United States where he is given a new life.
Date unknown: An uprising takes place in Central Asia and the CIS army is sent in, but is defeated repeatedly by a band of mercenaries gathered from around the world. As a result, a democratic military regime, named Zanzibar Land, declares its independence.
Date unknown: Genius Czech bio-technologist Dr. Kio Marv creats "OILIX", a micro-bio-chemical that could refine high purity crude oil and petroleum.
December 24th: Zanzibar Land crisis: Solid Snake defeats Gray Fox, kills Big Boss and destroys Metal Gear D. He vanishes and decides to live in the solitude of Alaska.
Date unknown: Liquid Snake joins FOX-HOUND as the leader of the field combat team.
Date unknown: Naomi Hunter joins the FOX-HOUND medical staff, and begins DNA therapy research and experiments on soldiers.
January 1st: Millenium Bug: The Patriots spread a "data filter" worldwide, disguised as a software fix to impede the impact of the flaw in various computer systems.
Date unknown: Dr. Clark (FOXHOUND's medical chief) dies in a lab explosion caused by Gray Fox, who manages to escape. Naomi Hunter covers the incident and takes over Dr. Clark's job.
Late February: Shadow Moses incident. FOX-HOUND is disbanded.
March: George Sears resigns as President of the United States. He is replaced by James Johnson.
Date unknown: Solid Snake and Otacon found Philanthropy.
April 30th: Jack and Rose meet each other for the first time.
August 8th: U.S.S. Discovery incident. Ocelot hi-jacks RAY.
Date unknown: Olga Gurlukovich gives birth to a child, who is kidnapped by the Patriots.
October: Dead Cell is caught in a surprise attack, losing two of its key members (Chinaman and Old Boy). Only Fatman, Fortune and Vamp survived.
April 29th: Big Shell incident. Sons of Liberty uprising. Raiden sneaks in. The deaths of Fatman, Fortune, Emma Emmerich, Olga Gurlukovich, Ames and the President of the USA.
April 30th: Arsenal Gear crashes into Federal Hall. Solidus's death. Otacon finds out that the original Wisemen Committee has been dead for almost 100 years.