Big Boss , real name John ,  also known as Jack , and formerly known as Naked Snake , Vic Boss,    Ishmael , Saladin, or simply Snake , was a renowned special forces operative and mercenary commander. He founded U. Big Boss later established the military states of Outer Heaven and Zanzibar Land as bases for his companies, in order to realize his ambitions of creating a nation for soldiers. Considered by some as "The Greatest Warrior of the 20th Century," he earned such monikers as "the Legendary Soldier"  and "the Legendary Mercenary,"  feared in combat by both friend and foe as a hero and a madman.
Having his genetic code used as part of the government project Les Enfants Terribles , Big Boss was the genetic father of Solid Snake his subordinate and later nemesis , Liquid Snake and Solidus Snake. He was also the mental and physical template for his body double and former subordinate, Venom Snake , with whom he shared the title of "Big Boss. Through the experience, Jack grew to hold The Boss in great respect and reverence, viewing her not only as a mentor, but also as a parental figure of sorts.
They went their separate ways on June 12, In , Jack was involved in the Bikini Atoll test of the first airborne detonation of a hydrogen bomb. Unlike most of his friends present during the test, Jack did not develop symptoms of leukemia , thyroid cancer , or radiation poisoning, but was rendered sterile.
In , Jack carried out covert operations alongside Python during the early stages of the Vietnam War , before America officially participated. He later stated that Python was one of the few soldiers he could completely rely on in battle. The two also played poker together, leaving Python owing Snake money. The two were later involved in a mission together where Python was shot and presumed dead.
Prior to August , Jack served in the Green Berets for several years. By late , he had become experienced at sniping in urban and marine environments,  and had eaten snakes during previous survival training exercises,  feats which would prove useful in future missions. Before he knocked the defeated Ocelot unconscious, Snake complimented the young officer on his gun-fighting skills, but suggested that his rather flashy style was better suited to revolvers than pistols.
As Snake escorted Sokolov back to the extraction point, the professor explained to him that the Soviet government had forced him to work on a new revolutionary weapon, the Shagohod. Fearing the destructive power of this weapon, Sokolov begged Snake to make sure to warn his government about its existence and see to its destruction.
Following his rescue, Snake was placed in an advanced intensive care unit where he was interrogated by agents of the U. Government , regarding The Boss's defection. The government had at first been planning to use them as scapegoats for the failed mission by charging both of them with high treason for their connection to The Boss, but had dropped the idea due to more pressing matters arising.
Volgin's detonation of the nuclear warhead had created an international incident, as Soviet intelligence had detected both the explosion and the American plane that had delivered Snake in the area, and now the Soviet government were demanding an explanation.
The Soviet leader, Nikita Khrushchev , was personally willing to believe that a rogue element of his intelligence service had been behind the detonation, but had pointed out that without any substantial evidence to back this claim, he would be unable to convince his cabinet and the Soviet army, who were both pressing for a nuclear retaliation against the Americans, of the U.
Khrushchev was able to buy the Americans a week to find the evidence, but warned that failure to do so would in all probability trigger a full-scale nuclear war. So instead, the U. They would both be cleared of any involvement in the defection under the condition that Snake, again under Zero's command, would return to Tselinoyarsk, eliminate The Boss, destroy the Shagohod, and recover Sokolov and the remaining nuclear warhead.
This mission was designated Operation Snake Eater. For his support team, Para-Medic was once again signed on, along with the new member " Sigint ", a technology and weapons expert. Despite not having completely recovered from his previous injuries, Snake was redeployed to Tselinoyarsk via a D drone prototype.
Unbeknownst to him, however, he was secretly being followed by XOF commander Skull Face, who had been ordered to follow, assist and clean up after Snake. Shortly after his landing, The Boss appeared before him on a white horse.
Snake demanded an explanation for her actions, but she refused to provide one, and instead disarmed him with ease and dismantled his gun. The Boss then told him to leave the area, saying she would have to kill him if he persisted in following her, before riding away. She provided him with a new gun, intel on Sokolov's whereabouts, telling him that he was held at Graniny Gorki , a Soviet research plant in the area, and a scientist disguise to help him infiltrate the base.
Though Snake was wary towards EVA to begin with, as she failed to give him the correct countersign to prove her identity, he became convinced that she was on his side when she helped him to fight off another attack from Ocelot, who attempted to enact revenge on Snake for his humiliating defeat during the Virtuous Mission.
He did, however, also prevent EVA from shooting the fleeing Ocelot, allegedly because he was "still young," although he had actually taken a liking to him. Making it to Graniny Gorki, Snake donned his scientist disguise and infiltrated the complex. As he searched for Sokolov, he came across the bitter Soviet scientist Aleksandr Leonovitch Granin , Sokolov's professional rival, who drunkenly told him about the prototype designs for Metal Gear he was working on and how he planned to share them with a friend in America as revenge against his superiors for not appreciating his work.
Granin also told Snake of the Philosophers' Legacy , and explained that it was responsible for making Volgin as wealthy and powerful as he was. When Granin learned that Snake was an American agent and on a mission to extract Sokolov, he happily told him that Sokolov was actually being held at the military compound of Groznyj Grad where he was being forced to continue his work on the Shagohod, and then handed him a key card that would help him gain entry to the fortress, in the hopes that Snake would succeed in his mission and that having Sokolov out of the way would help him advance his own career.
He also had another run-in with Ocelot, who challenged him to a gun duel at the Bolshaya Past crevice, which ended inconclusively when Ocelot fled the scene after noticing one of The Pain's hornets scouting the area.
Faced with having to the Groznyj Grad fortress, in order to locate Sokolov and get closer to the Shagohod, Snake was told to incapacitate the GRU officer, Ivan Raidenovitch Raikov , who was Volgin's secret lover, and steal his uniform in order to infiltrate the base. Snake's infiltration attempt did, however, fail when he happened to run into Volgin, who saw through Snake's disguise, resulting in his capture.
Snake awakened a bag over his head in an interrogation room, to the sounds of Sokolov's apparent death at Volgin's hands. Volgin then turned his attention to Snake, repeatedly hitting him and electrocuting him with his lightning powers, while demanding to know the details of his mission and if he had any accomplices.
When Snake refused to break, The Boss stepped and tried to convince Volgin that his attempts were in vain as she had personally trained Snake to never give in to torture, but a frustrated Volgin instead intensified the torture while asking Snake if he was after the Philosophers' Legacy he had in his possession, before telling him that he had hidden the Legacy in an underground vault in Groznyj Grad, so he would never get his hands on it.
During the torture, a transmitter fell from Snake's body. When Volgin demanded an explanation for that, The Boss claimed that she had planted it on him, to track his movements. Volgin then demanded proof and that her and Snake was not colluding against him, and asked her to cut out Snake's eyes. Before The Boss could so, however, EVA, in her disguise as Tatyana, intervened and demanded that they stopped, causing Ocelot to step in and accuse her of being the spy who had aided Snake.
Snake, attempting to protect EVA, bumped into Ocelot, causing the gun to go off in his face, which saved her life at the cost of his own right eye. Satisfied with what had taken place, Volgin departed, telling a distraught EVA to join him in his room. Ocelot, meanwhile, congratulated Snake on surviving the torture and punched him in the back unbeknownst to Snake, placing the transmitter on his body again , before also departing.
The Boss, meanwhile, covertly handed Snake a gun and a fake death pill and told him to make his escape when he had the chance. Before the guards arrived to grab Snake, EVA leaned in on him and quickly explained her hidden escape route from Groznyj Grad, telling him to meet her in the sewers under the complex.
Back in his holding cell, Snake managed to outwit the prison guard, Johnny , and made his escape from Groznyj Grad. By sneaking into the sewers, Snake headed to the rendezvous site EVA had told him about to meet her there. EVA, however, radioed in to warn that his escape had been discovered and that the Ocelot Unit was hot on his heels. While trying to evade them, Snake eventually ended up surrounded at a point where the sewer ended in a waterfall. Ocelot showed up once more, demanding that the unit did not interfere as he gloated about getting to enjoy his revenge, and prepared to shoot him, but Snake evaded him by jumping from the waterfall and landing in the pool below, almost drowning in the process and suffering a near-death experience involving the deceased Cobra member, The Sorrow.
Snake reunited with EVA, retrieved his equipment from her, and adopted the use of an eye patch. Snake returned to Groznyj Grad and successfully destroyed the Shagohod's hangar, eventually defeating Volgin and destroying the Shagohod itself. However, The Boss was waiting, and she confronted Snake in a field of white flowers.
She reminded him of his duty as a soldier, prior to engaging him in a final duel. To ensure that Snake would carry out his mission, The Boss radioed Russian fighters to begin bombing Rokovoj Bereg, which was only ten minutes away from their position. She gave Snake some parting words, which would come to greatly shape his worldview and haunt him for the rest of his life:. Snake fought his mentor with great reluctance, and after a fierce battle, he eventually incapacitated her.
As Snake walked up close to the injured Boss, she gave him the Philosophers' Legacy, explaining that she had stolen it from Volgin earlier, and told him to keep it safe. She then calmly gave him her gun and urged him to finish her off. Snake obliged and pulled the trigger.
Snake and EVA then started to make their escape in the WIG, but before they could do so, they were once again confronted by Ocelot, as he used a flying platform to board the plane and challenge Snake to another fight. After an inconclusive fist fight, Ocelot instead suggested that he and Snake should settle it in a game that combined Russian roulette and quick draw, but not before they exchanged their real first names with each other Adamska and John.
After they both fired off their guns without killing each other, an amused Ocelot revealed that he had played a trick on Snake and that the bullet was a blank. He gave Snake a wry smile as he hinted they would probably meet again. He then jumped off the plane, allowing Snake and EVA to leave the area. EVA and Snake eventually made their way to Galena, Alaska, where two sought refuge in an abandoned cabin, sharing together a night of tumultuous passion.
As Snake awoke the next morning to find EVA had left him sometime during the night, having taken the Philosophers' Legacy with her, he also discovered a tape recording she had left behind for him before she abandoned him. In it she explained that she had never been the real EVA, but was actually a triple agent working for China.
While under orders to kill anyone who knew this, she had nevertheless decided to spare his life, denying that she had done so because she had fallen in love with him, but instead because she had personally promised The Boss that she would keep him alive. She also told him the truth about The Boss' mission: namely, that The Boss had been a double agent all along, the U. However, as a result of Volgin's unanticipated decision to detonate one of the American nuclear warheads in a display that would destroy Sokolov's research facility, the U.
The Boss herself had agreed to this alteration of the original plan, willingly giving up her life and reputation to save both her country and the world from nuclear war, all the while knowing that history would later remember her both as a traitor and a war criminal. Snake eventually rendezvoused with the U. Meanwhile, members of the government talked about his great skills as both a soldier and agent, considering that he might be the right man to train and head a new unit of other people with his abilities.
The newly-christened Big Boss, however, found no feeling of pride or accomplishment in the whole affair. Having learned the true nature behind Operation Snake Eater, he only felt shame.
When Zero tried to congratulate him, Big Boss was unable to look him in the eye, and quietly left the ceremony. As he stood over The Boss' anonymous grave at Arlington National Cemetery, Big Boss came to the conclusion that he had lost sight of what he was fighting for, and with it his patriotism for his country.
Because of this, as well as his blaming himself for allowing it to happen, he retired from FOX. Unbeknownst to him, his disposing of Colonel Volgin had also made him a hero to the people of the Soviet Union. Snake's retirement from war was short lived, and his attempts at becoming an instructor or hunting guide failed.
After defeating him and nursing him back to health,  he escorted him to a rehab facility where he could be taken care of. During this time, he also attempted to find EVA, but was unable to find a trace of her for years.
Although he had been labeled Big Boss and became a legend in the black ops world due to his exploits, he continued to use the codename Naked Snake because he felt that he was unworthy of the title of Boss. Big Boss was captured by FOX and taken to the peninsula, where he was imprisoned and interrogated.
The agent who led the rebellion managed to gather FOX members who specialized in solo sneaking missions and kill off all those who opposed, with Snake believed to be the only one capable of doing so.
Big Boss managed to contact Para-Medic , who told him that both he and Major Zero had been charged with treason by the Pentagon, believing them the masterminds behind the revolt. Big Boss and Campbell escaped and went on to persuade former Red Army soldiers, along with disillusioned FOX operatives, to join them and rise up against the revolt.