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{{Spartan infobox
|name=John-117
|image=[[Image:HailToTheChief.jpg|300px]]
|spartantag=SPARTAN-117
|homeworld=[[Eridanus II]]
|birth=[[2511]]
|death=
|species=[[Human]]
|gender=Male
|height= 2.08 m / 6ft 10in (7ft in armor)
|hair=Brown
|eyes=Brown
|cyber=Neural Interface
|affiliation=[[United Nations Space Command]] [[UNSC Navy|Navy]]
|rank=[[Master Chief Petty Officer]]
|specialty=Commander
|battles=[[Battle of Chi Ceti]], [[Battle of Jericho VII]], [[Battle of Sigma Octanus IV]], [[Battle of Reach]], [[Battle of Installation 04]], [[Operation: First Strike]], [[First Battle of Earth]], [[Battle of Installation 05]], [[Second Battle of Earth]], and others.
|class=Class I: [[2525]]
}}
<center>''Looking for the rank also called [[Master Chief Petty Officer|Master Chief]]?''</center>
{{Quote|No soldier should be honored for doing what is expected.|John-117 to [[First Lieutenant]] [[Niraj Shah|Shah]], [[Second Battle of Mombasa]]}}
'''Master Chief Petty Officer John-117''' was a [[SPARTAN-II]] of the [[UNSC]] [[UNSC Navy|Naval]] [[Naval Special Warfare|Special Warfare Group]]. With almost 30 years of active duty, he is one of the most decorated soldiers in the [[UNSC Navy]]. In [[2553]], John-117 went missing in action after the [[Battle of Installation 00]] when he and the [[Arbiter (character)|Arbiter]] eliminated the [[Flood]] threat <ref>''[[Halo 3]]'', level ''[[Halo (Halo 3 Level)|Epilogue]]''</ref>. He is one of the most popular character in the game, and is the main protagonist in the Halo Series.

He is also known as the "[[Demon]]", "Master Chief", "Spartan-117", "Chief" and "[[Reclaimer]]". 

==Biography==
===Childhood and Spartan Training===
As a child, John-117 (otherwise known as [[Master Chief]]) lived in [[Elysium City]] on [[Eridanus II]]. [[John-117]] is said to have had brown hair, freckles, and a small gap between his front teeth. At the age of six, he was identified by [[Dr. Catherine Halsey]] as one of 150 preliminary candidates for the [[SPARTAN-II Program|SPARTAN-II]] [[SPARTAN_Program|program]]. John was an ideal physical candidate, standing a head taller than his schoolmates, having perfect physical proportions, and exhibiting quick reflexes. His genetic structure also stood up to [[Dr. Halsey]]'s rigorous requirements. When Dr. Hasley and [[Lieutenant]] [[Jacob Keyes]] visited Eridanus II to study him, they were impressed with his intellect and more importantly, his luck. In a final test of his viability as a candidate, he was asked to determine which side an old coin would land on. He watched the coin as it flew in the air and caught it before it could land. Dr. Halsey believed that he either 1) Saw what side it landed on and called out that side, or 2) He ''picked'' what side he wanted.<ref>''[[Halo: The Fall of Reach]]'' pages 21-26</ref> John and 74 other six-year-olds were "conscripted" -- covertly kidnapped from their homes without their consent -- and replaced with [[Flash Clones]] which later died of natural causes.<ref>''[[Halo: The Fall of Reach]]'', Page 270</ref>

John was renamed John-117 and began a new life that eliminated all aspects of civilian life. The Spartans trained under [[CPO Mendez]] for seven years, receiving tutelage in history and military strategy as well as weapons and physical fitness training. He bonded early with [[Kelly-087|SPARTAN-087]] and [[Samuel-034|Spartan-034]], who would be the only close friends he would ever have. Sam's untimely death in [[2525]] affected John profoundly.

When the Spartans reached the age of eight years old, they went on their first training mission. The Spartans were dropped over a wood located deep in some mountains and expected to get safely to their extraction [[Pelican]]. The children also had instructions to leave the last child arriving behind. When the group came upon the [[Pelican]], it was guarded by armed men. These armed men were actually [[Marines|UNSC]] soldiers, but were not in uniform and therefore mistaken for a hostile threat. John showed early acumen in critical thinking and tactics, not wishing to take it for granted that guards would be friendly toward the children. He came up with a plan to take the men down, capture the drop ship, and ensure the safe extraction of every team member, as he made sure he was the last person aboard. to do this he ended up hijacking a [[UNSC]] dropship with the help of Deja, and beat down the men with stones and many feet. This action caused him to be promoted to Squad Leader of the Spartans.

At the age of 14, John underwent the dangerous and painful process of [[SPARTAN-II Augmentation Procedures|augmentation]] that caused most of the Spartans to die. John-117 was one of 33 Spartans who made it through the process unscathed. When John was only 14 years old, he is also said to have a body of an 18 year old athlete.

===Early Military Career===
Promoted to Squad Leader at the age of 14, John-117's first mission was against rebels in the asteroid belt of the [[Eridanus System]], where his home world was located. He was slightly wounded while leading his squad to capture rebel leader [[Colonel Robert Watts]]. He received a [[The Purple Heart|Purple Heart]] after this mission.<ref>''[[Halo: The Fall of Reach]]'', pages 75-94</ref>

Shortly after that, He and his [[Spartans]] would fight the Covenant for the next 27 years, employing the MJOLNIR Mark IV armor. John's first battle against the [[Covenant]] was just after they received the Mark IV armor. The Spartans launched with thrusters from a Pelican dropship. Each Spartan carried an Anvil missile with them to destroy a Covenant ship. Only two other Spartans made it to the ship with John, and entered through a hole in its hull, which was put there by a MAC round. These Spartans were [[Samuel-034]] and [[Kelly-087]]. They succeeded the mission and blew up the Covenant ship, but lost Sam in the process due to a breach in his suit so he could not go back into vacuum. This first UNSC victory against the Covenant showed John that the Covenant could be beaten, but at a high cost.

John served in over 200 missions against the Covenant, including the [[Battle of Jericho VII]] and the [[Battle of Sigma Octanus IV]], in which he detonated a nuclear bomb to clear all forces from the planet. This was one of only a few UNSC victories. A data crystal was discovered during this mission which contained coordinates of [[Installation 04]] and led up to the events in [[Halo: Combat Evolved]] and [[Halo: The Flood]]. He also received every medal except for the POW(Prisoner of War)medal. He is also considered the luckiest and the bravest of the Spartans.

The [[Battle of Reach]], though brief, was of great significance for John. The majority of the Spartans went to the planet's surface to protect MAC generators. John, with [[Linda-058]] and [[James]], was sent to a docking station to protect an unsecured NAV database. If the [[Covenant]] obtained it they would find out the location of Earth, which was still a closely guarded secret. John was successful, but at a great cost. James tumbled into deep space and Linda was gravely wounded. John saved four other Marines including [[Sergeant Johnson]]. The team returned to the {{UNSCShip|Pillar of Autumn}} and was placed into cryo sleep as the ship fled Reach.

===Defense of Earth and Humanity===
{{spoiler}}
====Installation 04====
[[Image:180px-Masterchief-and-company.png|left|thumb|Master Chief being briefed.]]
Once arrived at [[Installation 04]] the ''Pillar of Autumn'' came under attack by Covenant forces. Captain [[Jacob Keyes]] ordered John to be woken and tasked with ensuring the escape of the ship's [[AI]], [[Cortana]], while Keyes crash-landed the ship onto the ring. Initially fighting on Halo was between UNSC and Covenant forces, but after Captain Keyes' unwitting release of dormant [[Flood]] parasites, the majority of both forces were infected by the Flood and fighting shifted to eliminating the new enemy. 
John soon came to the scene where he is responsible for retrieving an artifact called the Index for [[343 Guilty Spark]], a device which is said would activate and destroy all Flood Forms within large radius. The explanation was soon proven wrong by the revelation of Cortana that the installation's true purpose is to destroy all sentient life forms in the galaxy large enough to starve the flood to death. 
John soon commenced the three-side combat where the Covenant, the Flood, Sentinels battle around the Control Room. 
Soon he returned and attempted to save Keyes, but it was too late, the Flood was destined to get off the ring. 
With this, John retrieve Keyes neural implant that could activate the Pillar of Autumn's Fusion Reactor which would subsequently blow up the ship to destroy the ring. 
Successfully destroying the Fusion Reactors, John reached the extraction bay in a 5 minute Warthog Run and escaped the Ring before it destroys itself. 
Very few other members of the UNSC forces survived, notably [[Avery Junior Johnson|Sergeant Major Johnson]].<ref>''[[Halo: The Flood]]''</ref>

====OPERATION: First Strike====
[[Image:First Strike.jpg|right|thumb|150px]]
After the destruction of Alpha Halo, Cortana and the Master Chief fled in space in the [[Longsword]] they escaped in. He discovered three cyrotubes floating nearby, one containing [[Linda]], and retrieved them. Soon after, the Covenant Flagship ''[[Ascendant Justice]]'' came into the system along with a few cruisers. A nearby Pelican drop ship fired at the cruiser to distract it. John linked the two vessels and brought its passengers aboard to the Longsword. Seven others helped John in capturing a Covenant ship, eventually rendezvousing with the [[Eridanus Rebels]] and destroying the Covenant space station ''[[Unyielding Hierophant]]''. 

John faced a dilemma regarding the combat data on the Flood. Providing regular data, and not complete data, would protect Sgt. Johnson from possible experimentation by ONI, as he survived Flood infection due to complications from Boren's Syndrome.<ref>''[[Halo: First Strike]]''</ref> 

John and the few remaining Spartans, Linda, Grace, Will, and Fred, focused on finding a way to stop the Covenant from reaching Earth, the location of which has been discovered. They decide to destroy the Covenant Station '''Unyielding Hierophant''. The Spartans infiltrated the ship, and after eleven hours on board reach a temple, where a copy of Cortana warns them of a new type of guard known as "[[Brutes]]". Linda took a sniper post and the other four entered the temple. They are ambushed by Brutes, and John is nearly killed, but manages to kill their attackers. Grace is killed by a [[Brute Shot]] that Brutes  Chieftains used and John activated the fail-safe on her armor.

The team sabotaged the generator in the ''Hierophant'' and as they escaped out a side door, the fail-safe on Grace's armor activated, disintegrating several Elites and many Grunts. John, Fred, and Will were quickly spotted by three Banshees, but their Elite pilots were hit by Linda's sniper fire. The Banshees were then captured by the Spartans. John doubled back to retrieve Linda, who took down four more Elites attempting to kill John. They quickly escape, and arrive back at the ''[[Gettysburg]]''.

Vice Admiral Whitcomb and Lieutenant Haverson piloted the ''Ascendant Justice'' straight towards the ''Unyielding Hierophant''. Whitcomb discusses the Alamo and Thermopylae with John, then prepares to fight the Covenant off while the ''Unyielding Hierophant'''s fusion reactor detonates. Every one of the five hundred covenant ships maneuvers in right next to the ''Ascendant Justice'', and the Admiral draws an [[SMG]]. The Admiral and the Lieutenant die when the fusion reactor explodes. The explosion annihilates four-hundred and eighty-eight ships of the Covenant fleet, leaving only a dozen badly damaged ships to invade Earth. John leaves after witnessing Whitcomb's sacrifice, and arrives back at Earth with the last members of his team, Linda, Will, and Fred.

====First Battle of Earth====

[[Image:Covenant bomb and core.jpg|thumb|right|Master Chief with the Covenant bomb]]
{{Quote|Something's not right. The fleet that destroyed Reach was fifty times this size.|[[Lord Hood]]}}



Aboard ''[[Cairo Station]]'', John received Mark VI [[MJOLNIR]] armor and attended an awards ceremony. The ceremony was interrupted by the [[First Battle of Earth]]. John successfully repulsed Covenant boarders from the station. Then after fighting through several waves of Elites which allowed Cortana to  access and deactivate the boarder's demolition device. He "gave the Covenant back their bomb" by launching himself and the device, via explosive decompression from one of the station's launch bays, toward a Covenant warship. A timely strike by Longsword interceptors opened a breach in the warship's hull allowing John to direct the bomb into the ship's power plant.

John was then deployed to [[New Mombasa, East African Protectorate]] aboard the {{UNSCShip|In Amber Clad}} against Covenant ground forces. His Pelican drop ship was shot down by a [[Scarab]]'s main cannon. John and other surviving Marines fought their way to the other surviving Pelicans. After a rendezvous with [[Gunnery Sergeant Pete Stacker]] in the Zanzibar Hotel, in [[Old Mombasa]], the Master Chief destroyed Covenant units along the shore of the city as he chases the tracks of the Scarab. Arriving at the edge of Old Mombasa, John received a [[Scorpion Tank]] from [[Sergeant Johnson]]. 

Fighting through numerous highway tunnels and suburbs, John reached the city center, where Marines under the command of [[Sergeant Banks|Staff Sergeant Banks]] were pinned down. With the assistance of the [[Marines]] and a large stockpile of weapons, John boarded and was able to destroy the Scarab. The Master Chief is then transported to ''In Amber Clad'' to intercept the [[Prophet of Regret]]'s flagship. When the flagship starts to enter Slipspace, [[Commander]] [[Miranda Keyes]] is granted permission to follow it. The Master Chief and all on board ''In Amber Clad'' were brought to [[Installation 05]].<ref>''[[Halo 2]]''</ref>

====Installation 05====
{{Quote|Cortana... what exactly am I looking at?|Miranda Keyes}}{{Quote|That... is another Halo.|Cortana}}
Forced to act quickly once at Installation 05, John manned a [[Human Entry Vehicle|HEV]] with several [[Orbital Drop Shock Trooper|ODST]]s, tasked with locating and assassinating the Prophet of Regret. Cortana informed him of Regret's intent to fire Halo as soon as possible. He tracked the Prophet of Regret to a temple in the middle of a lake, but not before witnessing countless Covenant vehicles coming out of slipspace, followed by High Charity. He quickly dispatched the Prophet of Regret, and escaped the temple shortly before it is destroyed by an overhead cruiser which glassed the building as John just got out of the way by jumping off the edge of the construct and into the water.

Losing consciousness and so unable to swim in the lake, he was captured by a long tentacle belonging to the Flood [[Gravemind]]. Shortly after, the [[Arbiter (character)|Arbiter]] was also captured. The Gravemind appealed to the common interest that Flood and Humans share-- that of not wishing the Halos to be fired. John agreed. The Gravemind then tasked both captives with locating the Index, sending them to the two most likely locations. John was sent to High Charity, interrupting a sermon by the [[Prophet of Truth]]. In actual fact, this was the least of his worries; the conflict between the [[Elites]] and [[Brutes]] were at each others throats and leading the Covenant on the path to civil war. John was caught right in the middle.

John eventually caught up to the Prophets and their Brute escorts, though only a dying [[Prophet of Mercy]] (courtesy of a Flood [[Infection Form]]) was left to tell him where Truth was headed to Earth. In an instant, John was caught between a rock and a hard place; on one hand, the Covenant had the Index and could activate Halo. On the other, Earth's chances of withstanding the fleet Truth would lead were somewhere between slim and nil. In the end, he followed the latter, forced to leave Cortana behind so that if Halo was activated, she would detonate ''In Amber Clad'''s engines. John boarded the Forerunner ship, bound for Earth.

====Battle of Voi====
{{Quote|Radio for VTOL. Heavy lift gear. We're not leaving him here.|Johnson, upon finding what seems to be John's corpse}}{{Quote|Yeah... you're not.|John-117, grabbing Johnson's arm}}
After a series of firefights, captures and escapes,<ref>''[[Halo: Uprising]]''</ref> John escaped Truth's ship and crash landed on Earth, where he was found by Sergeant Johnson, the Arbiter, and the rest of their squad. Though the Master Chief seemed dead, he was awake and battle-ready only minutes later, showing that he could recover remarkably fast. He attempted to attack the Arbiter, thinking he was still an enemy. Johnson informed him that they were now allies, as the disillusioned Arbiter had defected from the Covenant.

John and the Marines traveled through the jungle, searching for evac to a nearby military base. Johnson and his team split up from John and the Arbiter, and they were later captured by loyalist Covenant Brutes and rescued by John and the Arbiter. After taking heavy fire from [[Phantom]]s a Pelican drop ship evacuated the team to a UNSC base known as [[Crow's Nest]]

The  base soon came under attack, but not before Lord Hood told John his plan. Commander Miranda Keyes decided  to evacuate all forces, many of whom were injured. John, the Arbiter and UNSC fought and defended the base during evacuation, planting a massive bomb to destroy the base along with Covenant forces. Master Chief fought his way through many Brutes, escaping the explosion in an an elevator. He met up with several Marine survivors underground, and they escaped the base and headed for the city of [[Voi]].

[[Image:Chief & Arbiter looking good.gif|thumb|The Master Chief and Arbiter covering each other's backs.]]
At the Battle of Voi, John pushed through many loyalist forces as he made his way to what was believed to be the [[Ark]]. Rather, this turned out to be a device that opened up a portal to the Ark. John destroyed a Covenant Anti-Air gun, Anti-Air Wraiths and a Scarab, allowing Lord Hood's ships to fire upon Truth's defenses. Truth fled through the portal with his loyalists forces, while the UNSC remained behind to determine their next move.

Just as the Second Battle of Earth seemed finished, a flood-infested Covenant warship crash landed in Voi. John fought to contain the Flood infection, learning that the only way to contain the Flood was to explode the warship. During the battle, [[Ship Master]] [[Rtas 'Vadum]] came to aid the UNSC. He fought off the Flood as the Master Chief was sent to retrieve Cortana from the warship, as it was believed she was on board. Aided by [[343 Guilty Spark]], John retrieved a damaged data device and returned to ''[[Shadow of Intent]]''. This data turned out to be a message, rather than Cortana herself. The Elites were able to stop the Flood infestation by [[glassing]] half of Africa, much to Lord Hood's displeasure.

The Elites and the UNSC watched Cortana's recording, which contained a warning that High Charity, now overwhelmed and controlled by the Flood [[Gravemind]], was headed for Earth. However, she offered hope, with information of a way to stop the Halos from firing and neutralize the Flood threat. Convinced of the reliability of Cortana's message, John resolved to journey to the Ark while Hood mobilized remaining UNSC forces on Earth. John accompanied a joint UNSC-Elite task force through the portal aboard the {{UNSCShip|Forward Unto Dawn}} to the Ark.

====Battle of The Ark====
{{Quote|Brute ships! Staggered line. Shipmaster! They outnumber us, three-to-one!|Elite Crewmember}}{{Quote|Then it is an even fight. All Cruisers, fire at will! Burn their mongrel hides!|[[Rtas 'Vadumee|Rtas "Half-Jaw" 'Vadum]]}}
The Elites carried UNSC forces through the slipspace portal which to the Ark. The team was determined to stop Truth from activating the seven Halos. They descended in Pelicans to the surface of the Ark to find the [[Silent Cartographer]], eliminating Covenant loyalists and securing a landing zone for ''Forward Unto Dawn''. Traveling in [[Scorpion|Scorpions]], John and other Marines located the Silent Cartographer and learned that Truth was in a [[Citadel]]. John, the Arbiter, and joint troops successfully assaulted the fortress.

John fought through loyalist forces and reached the top of the tower, where he deactivated part of the shield to Truth's location. Sergeant Johnson was captured in the battle but not killed, being spared to serve as a [[Reclaimer]]. John, the Arbiter, and the Elites deactivated the last tower of the citadel as [[High Charity]] came out of slipspace, bringing the Flood into the battle and damaging the Elite carrier ''Shadow of Intent''.

Entering the Citadel, John and the Arbiter pushed toward Truth's location, where [[Miranda Keyes]] had forced her way in, breaking through the window with her Pelican. She managed to kill a Brute, but was soon surrounded. Truth shot and killed Keyes with a [[Spiker]] as she hesitated before killing Johnson and herself. Johnson was then forced by Truth to activate the Halos. In an odd turn of events, John and the Arbiter made a temporary alliance with the Flood to stop the activation of the Halos. The final Brute defenses were defeated by the Flood as John and the Arbiter reached Truth. Truth was infected by the Flood and was killed by the Arbiter while the Master Chief deactivated the rings.

The [[Gravemind]] revealed himself, laughing as he succeeded in preventing his own destruction before turning on John and the Arbiter. The two escaped. As they were leaving the citadel, John saw a vision of Cortana that led him to the exit. He learned that a replacement for [[Installation 04 (II)|Installation 04]] had been built by the Ark. He decided to return to High Charity to retrieve Cortana.

On High Charity, John battled his way through hordes of Flood forces to reach Cortana, who still had the activation Index from the first Halo ring. John made his way back through High Charity and forced the Covenant City to explode. On his way out, Cortana detected a friendly unit which turned out to be the Arbiter. As High Charity was destroyed, the Flood was believed to be defeated but not destroyed.

====Firing Replacement Installation 04====
[[Image:DeathofAveryJohnson.jpg|right|thumb|The Master Chief watches as Guilty Spark severely injures Sgt. Johnson in an attempt of "treachery".]]{{Quote|Halo. It's so new... unfinished. I'm not exactly sure what will happen when we fire it...|Cortana to the Chief, evaluating their plan to activate Halo}}{{Quote|We'll head for the Portal. And we'll all go home|Chief to Cortana}}
The final task for John, the Arbiter, and Cortana was to destroy the Flood by activating the [[Installation 04 (II)|replacement Installation 04]]. The three landed on the Halo, finding that the Flood was not defeated, but instead trying to rebuild itself on the Halo. Flood dispersal pods released [[Combat Forms]] into battle against John and the Arbiter, forcing them to fight their way up to the tower where the ring could be destroyed. During the battle, Sergeant Johnson arrived on the Halo aboard ''[[Forward Unto Dawn]]''.
[[Image:Chief and Arbiter Escape Halo.jpg|thumb|right|The Master Chief and the Arbiter jump into [[Forward Unto Dawn]] in order to escape Halo.]]
[[Johnson]] helped the Master Chief and the Arbiter fight using a [[Spartan Laser]]. [[343 Guilty Spark]] opened the door to the control room and locked the Flood out. However, once inside, Guilty Spark realized that the team intended to fire the Halo before it could be completed, and that they did not intend to activate all the Halos as intended by the [[Forerunners]]. His "protocol" forced him to stop Johnson from activating Installation 04. He knew that a premature firing would destroy the Ark and so he shot Johnson, locked out the Arbiter from the room, and attempted to kill John. John stood his ground, even after being hit by several blasts, and fought. Just as the Monitor seemed invulnerable, Johnson shot the Monitor, temporarily distracting him. He then handed off the laser, and John finished off Guilty Spark. Johnson's injury was fatal, and he requested that John send him out "with a bang" after handing over Cortana's data chip and imploring him "Don't ever let her go."

Cortana activated Installation 04 and they fled the Halo fighting Flood the whole way. Both Cortana and the Arbiter gave their condolences for the loss of Johnson. The team boarded ''Forward Unto Dawn'' and escaped the explosion of Installation 04. However, the Slipspace portal opened for them could not sustain itself during the explosion, and its closure severed the ship in half, sending the Arbiter on to Earth and leaving John and Cortana drifting towards a nebula and an unknown planet.

===Missing in Action===
{{Quote|Hard to believe he's dead.|Fleet Admiral Terrence Hood}}
{{Quote|Were it so easy...|The Arbiter}}
John and Cortana were presumed dead when they did not make it back to Earth. The cockpit portion of ''Forward Unto Dawn'', bearing the Arbiter, crash landed on Earth and was left as a monument to those who died in [[Human-Covenant War|defense of Humanity]]. The Chief's Spartan ID number, 117 was carved into the memorial by an unknown party, and taped beside his number was the UNSC Master Chief Petty Officer of the Navy insignia patch.
[[Image:1804157725 61aa1692ab b.jpg|thumb|The Master Chief during the collapse of the portal.]]

===Survival===

John and [[Cortana]] did in fact survive the explosion of Installation 04(II) in the remaining cargo portion of the ''Dawn'', but it was nearly powerless and, without airlocks or a bridge, could not be properly navigated. Cortana, relieved that John survived, explained this to the Chief, and that it could take years before anyone could discover their distress signal. John stowed himself in a cryotube, at which point Cortana said "I'll miss you." John replied with, "Wake me...when you need me."

After an unknown amount of time, the remainder of the ''Dawn'' drifted toward an unknown object, with planet wide city lights that formed the [[Marathon (video game series)|''Marathon'' logo]]. Master Chief's fate is currently unknown.
 {{Spoiler End}}

==Age==
John's age is affected by the same ambiguities as all beings that leave their home worlds. By technical human Earth years, John is approximately 42 years old at the time he crash-landed on [[Installation 04]]. However, during the 27 Earth years that he has spent fighting the Covenant, considerable time was spent in [[Slipspace]]. Short Slipspace jumps can take several weeks in Earth time, and long jumps can take months or years, meaning that Slipspace travelers have not aged as much as those who did not travel with them. This phenomenon, [http://en.wikipedia.org/wiki/Time_dilation Time Dilation], is an aspect of [http://en.wikipedia.org/wiki/Special_relativity Special Relativity], in which clocks in a moving frame of reference appear to move more slowly than clocks in a non-moving frame of reference. The aging process can be further slowed in Slipspace by deep sleep in cryochambers, in which all cellular aging can be halted completely. 

So, although 41 Earth years had passed between John's birth and his arrival on Installation 04, his relative biological age would be much younger. It is presumed that in the 26th century, human longevity would be extended somewhere near its theorized maximum limit of 150 years, which would make 41 years of age the equivalent of being 21 years old in early 21st century aging. Considering that John has undergone physical augmentation, spent time in Slipspace (and in cryo while in Slipspace), his physical condition should be that of a young man at full maturity and the peak of physical health, with a numeric age in Earth years irrelevant to determining age.

==Trivia==
*John's spartan number 117 is a 7 referance(1x1=1x7=7)
*John's apparent favorite weapon is the [[Assault Rifle]] since it's the default weapon during the game in [[Halo Combat Evolved]] and [[Halo 3]]  . 
*John is the only Spartan to be wrongly presumed dead. 
*Fans have many theories as to the significance of his number, 117. Inside the [[Halo Universe]] the number was randomly assigned, but Bungie's choice has been theorized upon in many ways. For more, see: [[List of Biblical References in Halo]].
*In both [[Halo: Uprising Issue 1]] and [[Halo 3]], John is referred to as [[Sierra 117]]. This is a military-appropriate identifier using the [http://en.wikipedia.org/wiki/NATO_phonetic_alphabet Phonetic Alphabet].
*At the end of Halo 3, shown on the memorial to fallen heroes, the Master Chief Petty Officer insignia next to the 117 carving has three stars, with the third being covered up by tape. This is the rank insignia for Master Chief Petty Officer of the Navy (highest position for an enlisted sailor.) Rank insignia may have changed over the centuries or it may have been a posthumous promotion. It is also interesting to note that this is the good behavior variant of the rank insignia.
*John's name was never mentioned in any Halo game until the final cutscene in Halo 3.
*A model was never made for John's face in the game. Although Bungie has consistently stated that John's face would never be revealed to help players imagine themselves as Master Chief, numerous claims have been made that John's face was visible at some point (while playing on Multiplayer). During the [[Halo 3 Beta]] several players posted videos of a possible version of the Master Chief's face.<ref>[http://www.gamevideos.com/video/id/12217 GameVideos.com - Halo 3 'Spartan Face' video]</ref> This face was an easter egg left by Bungie, and is a model of one of their employees. Bungie's refusal to show John's face has been parodied several times in popular culture.
*If the player is playing on the Legendary difficulty setting on the last part of the last mission of the campaign called HALO with the IWHBYD skull turned on then on the side of the warthog there will be the numbers 117 scratched, small but, nonetheless there.
* John is voiced by [[Wikipedia:Steve Downes|Steve Downes]], who is also the Disc Jockey for the morning news in Chicago, Illinois.
*A wax sculpture of John-117 can be visit at Madame Tussauds, Les Vegas. <ref>http://www.xbox.com/en-US/games/h/halo3/articles/20070910-madametussaud.htm</ref>
*It may be coincidental that the name of John and introduction of the Spartan in Halo: Combat Evolved was referenced from the movie [[Wikipedia:Demolition Man (film)|Demolition Man]] where the main protagonist of the movie, John Spartan, was released from his Cryosleep.
*In Halo 3, on assault rifle, battle rifle, machine gun turret, magnum, and elephant turret bullets if seen closly in theater mode on the back, it says CHIEF
*John-117 is one of the Spartans truly MIA.[[User:Spartan-117 AR|Spartan-117 AR]] 13:08, 31 July 2008 (UTC)

==Sources== 
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[[Category:Humans (Characters)]]
[[Category:UNSC Naval Personnel]]
[[Category:Spartan-IIs|117]]

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