Only a small amount of information is known about Frank Jaeger's childhood. Born from German-American and Vietnamese parents, they died during the Vietnam War while Frank was still a child. As a result, he was discriminated due to his half-Caucasian heritage and was forced to work hard labor for the war effort. During his years fighting in the Mozambican War of Independence, Frank was known for his cruel war tactics: acting with the frank-ness of a young boy, he would trick enemies into letting their guard down, allowing him to kill them "with the ruthlessness of a hunter". This earned him the nickname "The Frank Hunter" by his enemies, but because he could speak a little German, his comrades called him Jaeger, giving him the proper name of "Frank Jaeger". Big Boss became acquainted with him as a nameless child soldier in a Marxist guerrilla group in Mozambique, sometime in 1966. Big Boss took Frank as a young child and left him at a rehab facility, thinking he would be safe.
While at the rehab center, he was taken by the CIA (The Philosophers) and used as a test subject for the "Perfect Soldier Project". The project turned the boy into a more efficient killer, capable of killing his targets without remorse, however it was at a cost. When he was not fighting, he was kept in a coffin-shaped sensory deprivation water tank which would reset his memories, and suppress his emotions. Also, this intense treatment seemed to enhance his reflexes allowing him to deflect bullets and become incredibly agile. Because Frank was the only surviving test subject of the project, he was deemed a lost number and was given the codename of Null.
As a teenager, Null became a member of the FOX Unit when it was under the leadership of Gene during the incident at La Peninsula de los Muertos. He confronted Big Boss during the operation, but was unable to defeat him. Despite being laid back into his stasis-tank, his memories of the battle with Big Boss couldn't be erased. He first escaped from the stasis-tank shortly after Ocelot's call to him, killing several officers before finally being subdued quickly by Gene by stabbing his hands and knees with knives and telekinetically pushing Null. Driven by want to kill Big Boss, he broke free of his chamber a second time and after slaughtering many of his own comrades he confronted Boss again, asking "Why won't you die? What do you hope to accomplish by living?". It was only after this second battle that Big Boss realized who Null really was. Big Boss defeated Null again and convinced him to seek help somewhere outside of the FOX Unit.
During the 1990s (or perhaps earlier), Frank became the only active field agent in FOXHOUND to receive codename, "Fox" (the highest commemoration given to any member of the unit), due to his extraordinary soldiering skills.
In 1995, Gray Fox was the agent assigned to Operation: Intrude N312. Fox's objective was to gather data on a top-secret nuclear weapon that the fortified state of Outer Heaven was secretly developing. Several days later, Fox was captured by enemy forces and the last message he transmitted to headquarters were the words "Metal Gear...". In the follow-up mission, known as Operation Intrude N313, Fox was rescued by newly-recruited FOXHOUND member, Solid Snake and Fox provided Snake with all the known facts about Metal Gear; a nuclear-equipped walking battle tank. Together, they successfully destroyed the Metal Gear prototype under development in Outer Heaven.
However, shortly after the destruction of Metal Gear, it was revealed that Big Boss himself was secretly the commander of Outer Heaven's forces all along. Sometime after the destruction of Outer Heaven, Fox deserted the FOXHOUND unit and disappeared along with Big Boss (who was presumed dead after his battle with Snake). Around this time, Fox followed him and helped in the formation of Zanzibar Land by becoming an active participant of the "War of Mercenaries". After his success in the war, he was assigned as commander of Zanzibar Land's Mercenary Force, also known as the "Dogs of War."
In 1999, Fox began hijacking several nuclear disposal sites with the revised Metal Gear D. This act, along with Zanzibar Land's kidnapping of Dr. Kio Marv, led to a retaliation from FOXHOUND, which was now under the command of Col. Roy Campbell. Snake was pulled from retirement and was the sole agent sent out to neutralize Zanzibar Land. During the course of Snake's mission, Fox began transmitting anonymous messages to Snake in order to help him overcome certain obstacles and traps. Fox and Snake met again after four years when the bridge leading to the detention camp where Dr. Marv was being held was destroyed by Fox himself. Ironically enough, Fox also caused the death of his former lover, Gustava Heffner (who was in Zanzibar Land, now serving as an STB agent and Marv's bodyguard), when he destroyed the bridge. Later, Snake successfully destroyed Metal Gear D and confronted Fox barehanded in a minefield. Snake won the battle and escaped the facility, leaving a presumed dead Gray Fox behind.
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