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Today in Halo

January

January 1

• The colony ship Odyssey is launched from the Sol system to colonize Reach in 2362.

January 2

• A battle takes place at the Theta Ursae Majoris system between the UNSC and Insurrectionists in 2504.
• Avery Johnson, Nolan Byrne, Ponder, and Healy begin training the Harvest militia in 2525.

January 3

• Gage Yevgenny, a Orbital Drop Shock Trooper, is born on Harvest in 2506.
• Forerunner artifacts are discovered on Onyx and all data pertaining to the planet is classified in 2511.
• Gage Yevgenny enlists in the Colonial Military Authority in 2524.
• The United Rebel Front launches a rebellion on Draco III in 2554.

January 7

• Serina is created and assigned to UNSC Spirit of Fire in 2530.

January 8

• Operation: FIRESIDE occurs, in which Orbital Drop Shock Troopers fight off Covenant attackers on Ariel, in 2552.
• Ruth Charet is elected President of the Unified Earth Government in 2553.

January 9

• James Cutter is transferred to UNSC Final Summit in 2514.

January 10

• Draco III is attacked and invaded by the Covenant in 2545.

January 12

• Supersoldiers of the Orion Project complete their first operation with only one causality in 2496.

January 14

• Construction of the Quito Space Tether is completed on Earth in 2313.

January 16

• The Deep Space Research Array is opened in orbit over Arcadia in 2498.
• Harvest residents celebrate the Solstice Celebration in Utgard in 2525.

January 17

• A skirmish over Harvest occurs when Covenant Kig-Yar encounter Avery Johnson and Nolan Byrne in 2525.
• The Minister of Fortitude and the Vice Minister of Tranquility learn of the presence of Forerunner artifacts on Harvest in 2525.
• Smart AI Iona is created on Earth in 2551.
• Iona is placed into stasis to prevent her rampancy in 2558.

January 18

• A telescope orbiting Mars inadvertently captures the first human photograph of High Charity in 2524.
• After the first conflict with the Covenant, UNSC Walk of Shame travels to Reach to request assistance for Harvest in 2525.
• Catherine Halsey learns that the Spartan-II augmentations are being studied on Algolis, Meridian, and Ariel for a secret program in 2532.

January 19

• Avery Johnson accelerates the Harvest militia's training to prepare them for the Covenant in 2525.

January 20

• Tobias Fleming Shaw, co-creator of the Shaw-Fujikawa Translight Engine, is born in 2220.
• Olympia Vale, a Spartan-IV, is born on Luyten in 2536.

January 28

• Lucy-B091, a Spartan-III, is born in 2533.

January 29

• The Orion Project is re-initiated in 2491.

January 30

• James Cutter turns down a command position on cruiser UNSC Prophecy in 2528.
• Catherine-B320, a Spartan-III, is born on New Harmony in 2530.
• Ellen Anders is recruited by the Office of Naval Intelligence.

February

February 1

• Henry Glassman, an astrophysicist, is born on New Carthage in 2522.

February 3

• Harvest's Tiara station makes long-range radar contact with the Covenant cruiser Rapid Conversion in 2525.
• The preparations are made for the SPARTAN-II program's augmentations in 2525.

February 4

• UNSC Spirit of Fire arrives at Harvest to assist the Third Fleet in its campaign against the Covenant in 2531.
• The United Nations Space Command is victorious in defeating the Covenant in the Harvest campaign in 2531.

February 7

• Indrid Lota is born on Aleria in 2530.
• A funeral service is held for the crew of the destroyed UNSC Prophecy aboard UNSC Spirit of Fire in 2531.

February 8

• Jacob Keyes, captain of UNSC Pillar of Autumn, is born on Earth in 2495.

February 9

• Covenant cruiser Rapid Conversion arrives at Harvest in 2525.
• J.D., an Orbital Drop Shock Trooper nicknamed the Rookie, is born on Luna in 2525.
• The Battle of Arcadia occurs, which results in a UNSC victory in 2531.
• The Battle of Jericho VII begins in 2535.

February 10

• The capture of Ellen Anders forces UNSC Spirit of Fire to follow a Covenant fleet to a shield world in 2531.
• UNSC Spirit of Fire is designated as "lost with all hands" in 2534.

February 11

• First formal contact between humanity and the Covenant on Harvest leads to conflict in 2525.
• The Human-Covenant War begins in 2525.
• Catherine Halsey determines that Cortana may be able to overcome a smart AI's seven-year lifespan in 2550.

February 12

• The Battle of Jericho VII ends, resulting in the Covenant glassing the planet, in 2535.

February 13

• Bliss is glassed by the Covenant in 2526.
• The Battle of XI Boötis A takes place, resulting in a UNSC victory in 2528.

February 15

• Catherine Halsey delineates the fundamentals of the SPARTAN-II program in 2511.

February 16

• Jerald Mulkey Ander, the future leader of the Secessionist Union, is born on Harvest in 2461.

February 18

• Wallace Fujikawa, the co-creator of the Shaw-Fujikawa Translight Engine, passes away in 2318.

February 19

• Onyx's ecology and geology are extensively studied by the UNSC Engineering Corps in 2492.
• The Spartan-IIIs of Gamma Company undergo their augmentations in 2551.

February 22

• Covenant cruiser Rapid Conversion destroys the town of Gladsheim on Harvest in 2525.

February 23

• A terrorist attack caused by the Freedom and Liberation Party occurs in the Haven arcology, on Mamore, in 2511.
• Harvest is evacuated by humanity, leaving the planet to the Covenant, in 2525.
• The Battle of Trove begins in 2531.

February 25

• The Battle of Trove ends in a UNSC victory after the destruction of the shield world in 2531.

February 26

• The crew of UNSC Spirit of Fire burn Flood-infected bodies rather than study them in 2531.

February 27

• Edward Buck is transferred into the Orbital Drop Shock Troopers by UNSC High Command in 2545.

February 28

• Jun-A266, Spartan-III, a is born on New Harmony in 2524.
• Miranda Keyes, commander of UNSC In Amber Clad, is born on Reach in 2525.

March

March 1

• The Battle of Harvest occurs, resulting in a Pyrrhic UNSC victory in 2526.
• UNSC Spirit of Fire's crew, without a functional slipspace engine, enter cryo-sleep in 2531.

March 2

• The Callisto Incident occurs, effectively beginning the Insurrection in 2494.

March 5

• Jul 'Mdama, leader of a Covenant remnant faction, is born on Sanghelios in 2489.
• Jorge-052, a Spartan-II, is born on Reach in 2511.

March 6

• The Office of Naval Intelligence's Onyx budget is limited due to lack of success in 2525.
• The Battle of 18 Scorpii occurs, during which Insurrectionists help secure a UNSC victory, in 2543.

March 7

• John-117, a Spartan-II, is born on Eridanus II in 2511.

March 8

• Luther Mann and Henry Lamb discover the Halo Array's firing sequence is active in 2555.

March 9

• The Quito Space Tether is officially named in 2401.
• The Spartan-IIs receive augmentations, with only thirty-three Spartans successfully recovering, in 2525.
• Preston Cole requests a series of requisitions, transfers, and favors from Reach Central Command in 2543.

March 10

• The WINTER CONTINGENCY protocol is enacted by the UNSC in 2526.

March 11

• Emile-239, a Spartan-III, is born on Eridanus II in 2523.

March 12

• Kojo "Romeo" Agu enlists in the UNSC Marine Corps, at the minimum age of sixteen, in 2541.

March 13

• Operation: KALEIDOSCOPE takes place on Harvest, resulting in the assassination of Jerald Mulkey Ander, in 2502.

March 15

• Ord Casto, the future High Prophet of Truth, is born on High Charity in 2396.
• Jameson Locke, Office of Naval Intelligence agent and Spartan-IV, is born on Jericho VII in 2529.

March 17

• Operation: FAR STORM, a joint Swords of Sanghelios–UNSC operation, begins in 2555.

March 19

• Catherine Halsey, creator of the SPARTAN-II program, is born on Endymion in 2492.
• Linda-058, a Spartan-II, is born on Verent in 2511.

March 20

• Benjamín Núñez, an Orbital Drop Shock Trooper, is born on Mars in 2527.
• Operation: FAR STORM ends after the firing of the Halo Array is averted in 2555.

March 21

• Franklin Mendez, trainer of the Spartan-IIs and Spartan-IIIs, is born on Sigma Octanus IV in 2492.

March 23

• Rho 'Barutamee, Supreme Commander of the Fleet of Valiant Prudence, is born on Sanghelios in 2479.
• Insurrectionists bomb a spaceport in Troisi City on Lodestone in 2526.

March 30

• A funeral service is held for deceased Spartan-IIs aboard UNSC Atlas in the Lambda Serpentis system in 2525.

April

April 1

• Catherine Halsey has the bodies of deceased Spartan-IIs cryogenically preserved in 2525.

April 2

• The UNSC and ONI prevent a terrorist attack on New Harmony Spaceport on Mars in 2526.

April 3

• Frederic-104, a Spartan-II, is born on Ballast in 2511.

April 5

• Miranda Keyes is awarded the Silver Star and promoted from Lieutenant to Lieutenant Commander on Reach in 2550.

April 13

• The Orion Project is initiated by the Office of Naval Intelligence in 2321.
• Sarah Palmer, commander of the Spartan-IVs aboard UNSC Infinity, is born on Luna in 2527.

April 18

• The Battle of Psi Serpentis occurs, resulting in a UNSC victory and Preston Cole's apparent death, in 2543.

April 20

• Wallace Fujikawa, co-creator of the Shaw-Fujikawa Translight Engine, is born in 2215.
• CMA Argo arrives in the Epsilon Indi system to investigate the reason for contact loss with Harvest in 2525.

April 21

• Douglas-042, a Spartan-II, is born on Asphodel in 2511.
• CMA Argo arrives at Harvest and is destroyed by Rapid Conversion in 2525.

April 22

• John-117 kills three Orbital Drop Shock Troopers after a fight broke out aboard UNSC Atlas in 2525.
• The Battle of Fumirole takes place in 2552.

April 26

• The Battle of Circinius IV takes place, resulting in the planet's glassing in 2526.

April 28

• Vice Admiral Michael Stanforth orders ONI scientists at CASTLE Base to refocus their studies on strategies to defeat the Covenant in 2526.

May

May 1

• Blue Team raids the United Rebel Front's Camp New Hope on Victoria, resulting in General Howard Graves' death in 2531.

May 3

• Catherine Halsey researches ways to increase the lifespan of a smart AI in 2526.

May 4

• Petra Janecek, a war journalist, is born in Serif on Lenapi in 2511.

May 6

• Onyx is recommended for colonization by the UNSC Engineering Corps in 2491.

May 7

• Argent Moon is commissioned by the Office of Naval Intelligence in 2553.

May 8

• Jerome-092, a Spartan-II, is born on Minister in 2511.
• Catherine Halsey undergoes the Hemley & Aubourn Behavior Analysis, with results reporting her unreliability, in 2551.

May 10

• During the Battle of Actium, Colonel Akono Menteith rallies the men and women of the 53rd Armored Division in 2545.
• SPARTAN-B312 takes part in a counter-insurgency operation on Mamore in 2552.

May 11

• Preston Cole's liver fails from cirrhosis and is subsequently replaced in 2525.

May 14

• Sandra Tillson, an xenoarchaeologist, is born on Coral in 2506.

May 16

• Caleb-095, a Spartan-II, is born on Luyten in 2511.

May 21

• Section Two of the Office of Naval Intelligence officially unveils the SPARTAN-II program to the public in 2547.

May 22

• James Cutter receives a Bronze Star for his actions aboard UNSC Glasgow in 2524.

May 28

• Andrew Del Rio, former captain of UNSC Infinity and senator, is born on Earth on 2500.

May 29

• John Forge, a veteran UNSC Marine Corps sergeant, is born on Earth in 2501.

May 30

• Some members of SPARTAN-III Beta Company are reassigned to non-combat roles in 2545.

June

June 1

• The Siege of the Inner Colonies begins, as the Covenant begins invading human strongholds, in 2536.

June 2

• Ripa 'Moramee, a future Arbiter, is born on Malurok in 2478.
• James Cutter, captain of UNSC Spirit of Fire, is born on Reach in 2479.
• A skirmish in the Theta Ursae Majoris system occurs, resulting in a draw, in 2501.

June 3

• Taylor Miles, a retired Orbital Drop Shock Trooper, is born on Mars in 2519.
• Operation: TORPEDO occurs on Pegasi Delta, resulting in the deaths of 298 of the 300 members of SPARTAN-III Beta Company, in 2545.

June 4

• Michael "Mickey" Crespo enlists in the UNSC Marine Corps in 2548.

June 5

• The United Nations is formed on Earth in 1945.
• Catherine Halsey becomes Chief Scientist of the Office of Naval Intelligence in 2522.
• Gabriel Thorne, a Spartan-IV, is born on Earth in 2534.

June 12

• Kojo "Romeo" Agu, Orbital Drop Shock Trooper and Spartan-IV, is born on Madrigal in 2524.
• Catherine Halsey sends her daughter to live with with her father, Jacob Keyes, on Luna in 2531.

June 13

• Lyrenne Castilla becomes recognized as a high-ranking Insurrectionist leader in 2503.

June 16

• The Casbah City bombing occurs on Tribute, resulting in numerous civilian casualties, in 2524.

June 18

• April Orenski, a Corbulo Academy of Military Science cadet and survivor, is born on Harvest in 2508.

June 19

• James Cutter enlists in an Officer Candidate School in 2504.
• The SPARTAN-II program is officially named in 2513.

June 27

• Catherine Halsey plans rehabilitation therapies for washouts of the SPARTAN-II program in 2525.

June 28

• Catherine Halsey relocates from Camp Hathcock to CASTLE Base on Reach in 2525.

July

July 1

• The Covenant begins to glass Harvest in 2525.

July 7

• The Rookie enlists in the UNSC Marine Corps in 2547.

July 8

• Tartarus, the future Chieftain of the Jiralhanae, is born on Doisac in 2491.

July 9

• Holly Tanaka, a Spartan-IV, is born on Minab in 2530.

July 10

• Samuel-034, a Spartan-II, is born on Harvest in 2511.

July 12

• The Section Three of the Office of Naval Intelligence begins using a new generation of smart AI in 2531.

July 14

• The Spartan-IIs participated in a training operation against UNSC Marine Corps personnel in 2523.

July 15

• Michael Stanforth, a vice admiral of the UNSC Navy, is born on Earth in 2486.

July 17

• Alice-130, a Spartan-II, is born on Passage in 2511.
• The Battle of Sigma Octanus IV begins in 2552.

July 18

• The Battle of Sigma Octanus IV ends, as all Covenant forces retreat, in 2552.

July 20

• Captain Alexander of UNSC Spirit of Fire retires and the ship is scheduled for refit in 2520.

July 21

• Catherine Halsey begins screening candidates for the SPARTAN-II program with Jacob Keyes in 2517.

July 23

• The Fleet of Valiant Prudence arrive at Reach and attempts to severe the off-world planet's communications in 2552.

July 24

• CAA Irbid claims to have begun the colonization of Tribute in 2364.
• Parg Vol, a terrorist and former Covenant Field Master, is born on Malurok in 2481.
• NOBLE Team investigates the downed Visegrad Relay on Reach and discover the Covenant's presence on the planet in 2552.

July 25

• The Fall of Reach begins in 2552.

July 26

• The Covenant attacks SWORD Base on Reach, an attack that NOBLE Team stop, in 2552.

July 27

• Operation: PROMETHEUS as SPARTAN-III Alpha Company attacks K7-49, a Covenant world, in 2537.

July 28

• A day of mourning is proclaimed by the UNSC following the apparent death of Preston Cole in 2543.

July 29

• SPARTAN-III Alpha Company destroys most Covenant reactors at K7-49 in 2537.

July 30

• Catherine Halsey begins working on the MJOLNIR Powered Assault Armor in 2511.

August

August 2

• Covenant reinforcements arrive at K7-49 and all participating members of SPARTAN-III Alpha Company are killed in 2547.

August 7

• Marcille Johnson, aunt to Avery Johnson, passes away on Earth in 2524.

August 8

• CAA Casbah begins colonizing Tribute in 2364.
• Catherine Halsey is recruited by the Office of Naval Intelligence in 2510.
• James Cutter becomes commander of UNSC Glasgow in 2519.
• James Cutter becomes captain of UNSC Spirit of Fire in 2525.

August 10

• Avery Johnson goes on a drinking spree after learning of his aunt's death and is transferred to Harvest in 2524.

August 12

• Mason Hundley, an Office of Naval Intelligence operative, is born on Luna in 2532.
• Covenant and UNSC forces battle at Szurdok Ridge on Reach in 2552.

August 13

• Ellen Anders, a renowned xenobiologist, is born on Arcadia in 2503.
• Sixty percent of the UNSC's fleet is recalled to Reach to aid in the ongoing battle in 2552.

August 14

• Operation: UPPER CUT is initiated to destroy Long Night of Solace over Reach in 2552.

August 15

• Thomas Lasky, captain of UNSC Infinity, is born on Mars in 2510.

August 16

• Robert Watts, founder of the United Rebel Front, is born on Mars in 2455.

August 17

• Preston Cole and Inna Volkov marry on Luna in 2492.
• Catherine Halsey and Jacob Keyes screen John-117 for the SPARTAN-II program on Eridanus II in 2517.
• John Forge is nearly court-martialed after being incarcerated for assaulting a senior officer in 2530.
• Smart AI Black-Box is created on the human Inner Colony of Mars in 2552.

August 18

• The Siege of New Alexandria begins on Reach in 2552.

August 22

• Hod Rumnt, the future High Prophet of Mercy, is born on High Charity in 2332.
• Edward Buck, Orbital Drop Shock Trooper and Spartan-IV, is born on Draco III in 2510.

August 23

• New Alexandria's population is evacuated during the ongoing Fall of Reach in 2552.

August 24

• Paul DeMarco, a Spartan-IV, is born on Algolis in 2532.
• SPARTAN-III Beta Company undergoes a series of training exercises to select candidates for further training in 2541.

August 25

• Doctor Catherine Halsey selects UNSC Pillar of Autumn for Operation: RED FLAG in 2552.

August 26

• Survivors at New Alexandria are evacuated from the city's remains in 2552.

August 27

• Carter-A259, a Spartan-III, is born on Biko in 2520.
• The Spartan-IIs are debriefed on Operation: RED FLAG on Reach in 2552.

August 29

• John-117 is first paired with Cortana, while Catherine Halsey is evacuated to CASTLE Base in 2552.

August 30

• Reach falls to the Covenant as UNSC Pillar of Autumn leaves the system in 2552.

September

September 1

• UNSC Spirit of Fire receives a refit at Reach and begins serving the UNSC Navy as a ground support vessel in 2520.
• Catherine Halsey works on improving the MJOLNIR Powered Assault Armor prototypes in 2525.

September 2

• Human freighter Horn of Plenty is attacked and raided by Covenant missionary ship Minor Transgression in 2524.

September 3

• Michael Sullivan, Senior Communications Director of the Office of Naval Intelligence, is born on Emerald Cove in 2510.
• The crew of Covenant missionary ship Minor Transgression learn of Harvest's location in 2524.

September 4

• Terrence Hood, Chief of Naval Operations and Chairman of the UNSC Security Council, is born on Earth in 2490.
• Catherine Halsey attempts to build a smart AI fractal housing within slipstream space in 2547.
• Wagner reports to the UNSC Security Council on the Fall of Reach in 2552.

September 7

• Catherine Halsey initiates Operation: WHITE GLOVE, destroying CASTLE Base in 2552.

September 8

• With recent breakthroughs in flash cloning, Catherine Halsey begins selecting Spartan-II candidates in 2511.

September 9

• Taylor "Dutch" Miles enlists in the UNSC Marine Corps in 2540.
• The Fall of Arcadia occurs, resulting in the Covenant glassing the planet, in 2549.

September 10

• Naomi-010 is conscripted into the SPARTAN-II program and replaced with a flash clone on Sansar in 2517.

September 11

• Spartan-IIs train against instructors donning Mark I MJOLNIR armor in 2525.

September 12

• The Spartan-IIs are briefed for their first mission aboard UNSC Pioneer in 2525.
• The Massacre at Eridanus Secundus occurs in 2552.

September 13

• Operation: FIRST STRIKE results in the destruction of Unyielding Hierophant and most of its fleet in 2552.

September 14

• The Spartan-IIs capture Colonel Robert Watts of the United Rebel Front on a mission at Eridanus Secundus in 2525.
• A new set of orbital defense platforms are scheduled to come online over Earth in 2552.

September 15

• James Cutter enrolls in the UNSC School of the North Star on Earth in 2500.
• Naomi-010, a Spartan-II, is born on Sansar in 2511.
• Kelly-087 is conscripted into the SPARTAN-II program and replaced with a flash clone on Imber in 2517.

September 16

• Catherine Halsey and Jacob Keyes finish screening candidates for the SPARTAN-II program in 2517.
• The distress signal from freighter Horn of Plenty is received by Sif on Harvest in 2524.

September 18

• Jacob Keyes and other key crew of UNSC Pillar of Autumn awake to check the ship's status in 2552.

September 19

• UNSC Pillar of Autumn arrives at Installation 04, after the Covenant, and a begins in 2552.
• Jacob Keyes is captured by the Covenant but rescued by John-117 on Installation 04 in 2552.

September 20

• John-117 meets 343 Guilty Spark on Installation 04, while the Covenant inadvertently releases the Flood in 2552.
• The SPARTAN-IV program enters development under the oversight of Margaret Parangosky in 2552.

September 21

• Rtas 'Vadum, former Covenant commander and Swords of Sanghelios founder, is born on Sanghelios in 2487.
• Preston Cole enlists in the UNSC Navy in 2488.
• Kelly-087, a Spartan-II, is born on Imber in 2510.
• The Battle of Sargasso takes place in 2546.
• John-117 resolves to destroy Installation 04 to stop the Flood in 2552.

September 22

• Preston Cole formulates a new way of calculating slipstream space input parameters in 2489.
• Installation 04 is destroyed, leaving only a handful of survivors in 2552.

September 23

• Seventy-five conscripted members of the SPARTAN-II program are brought to Reach in 2517.
• Survivors of Installation 04 rescue survivors of the Fall of Reach in 2552.

September 24

• The training of the Spartan-II candidates begins, led by Franklin Mendez, in 2517.
• Cargo vessel UNSC Dartmouth is boarded and captured by the Eridanus rebels in 2517.

September 25

• The second day of training, which includes a Ring the Bell exercise, for the Spartan-II candidates begins in 2517.

September 26

• Jameson Locke formulates a target profile on Thel 'Vadamee for ONI in 2552.

September 27

• Carris-137 accidentally kills a handler during her SPARTAN-II training in 2520.

September 28

• The Spartan-II candidates have their heads shaved, much to Kelly-087's violent "protest", in 2517.

September 30

• Cadmon Lasky, an Orbital Drop Shock Trooper, is born on Mars in 2507.

October

October 7

• CMA Battle Group 4 arrive at Harvest to investigate contact loss, but only Heracles escapes destruction by the Covenant in 2525.

October 8

• Floral Express discovers Installation 03 after fleeing the Battle of Tribute in 2552.

October 19

• Gek 'Lhar, terrorist and lieutenant to Jul 'Mdama, is born on Sanghelios in 2499.
• Kurt-051, a Spartan-II, is born on Circumstance in 2511.
• Anthony Madsen, a Spartan-IV, is born on New Llanelli in 2530.

October 20

• Michael "Mickey" Crespo, a former Orbital Drop Shock Trooper and former Spartan-IV, is born on Luna in 2530.
• The Battle of Earth begins when the Covenant arrives at the planet in 2552.
• Arbiter Thel 'Vadamee wipes out Sesa 'Refumee and his heretics and "rescues" 343 Guilty Spark in 2552.

October 21

• The Battle of Alpha Aurigae takes place, resulting in a UNSC victory in 2526.
• The Battle of Mombasa ends in a Covenant victory in 2552.

October 22

• Forerunner artifacts are found in Zone 67 on Onyx in 2511.

October 24

• James Ackerson successfully proposes the SPARTAN-III program to leading members of the Office of Naval Intelligence in 2531.

October 25

• The Office of Naval Intelligence sends an exploration-and-neutralization team to Installation 03 in 2552.
• A skirmish occurs on Mona Lisa when the Flood infect the ship's crew in 2552.

October 28

• Lod Mron, the future High Prophet of Regret, is born on High Charity in 2461.

October 31

• The Battle of Onyx begins between the UNSC and local Sentinels in 2552.

November

November 1

• The United Nations Space Command is ordered to full alert in wake of the Covenant threat in 2525.

November 2

• Retired Preston Cole is convinced to lead a battle group to retake Harvest and he is reinstated into the UNSC Navy in 2525.
• The Spartan-IIs are briefed on the Covenant threat and introduced to Project: MJOLNIR in 2525.
• The Battle of Installation 05 begins when the Covenant and UNSC discover the Halo in 2552.

November 3

• Preston Cole, an admiral of the UNSC Navy, is born on Earth in 2470.
• The Great Schism begins, leading to High Charity's fall and an abrupt end to the Battle of Onyx in 2552.
• Blue Team engages Covenant forces throughout Earth in 2552.
• Sangheili colony Joyous Exultation is destroyed by a NOVA bomb in 2552.

November 4

• Tedra Grant, a Spartan-IV, is born on Arcadia in 2533.

November 7

• Kurt-051 is taken to secretly train the Spartan-IIIs and is officially declared MIA, after a mission with Blue Team in 2531.
• Cortana is created from Catherine Halsey's flash cloned brain in 2549.
• A Catalog unit resumes its duties after awaking from dormancy in 2552.

November 8

• The Forerunner Dreadnought arrives in the Sol system with John-117 aboard in 2552.

November 10

• Tobias Fleming Shaw, the co-creator of the Shaw-Fujikawa Slipspace Drive, passes away in 2317.

November 12

• Preston Cole is given command of UNSC Everest and prepares himself for his first confrontation with the Covenant in 2525.

November 16

• James Cutter is assigned to serve on UNSC Brilliant Shores in 2507.

November 17

• Catherine Halsey and Jacob Keyes reunite at a conference at University of Calippus, leading to Miranda Keyes' conception in 2524.
• The Forerunner Dreadnought arrives at Earth and John-117 lands on the planet's surface in 2552.
• The Flood attempt to infect Earth but are stopped by Shipmaster Rtas 'Vadum in 2552.
• The Prophet of Truth and his fleet enter the Portal at Voi, pursued by the UNSC and Sangheili in 2552.

November 18

• The Flood-infected High Charity arrives at Mars and enters slipspace for Installation 00 in 2552.

November 23

• The Official Secrets Act is passed in 2550.

November 24

• Mark V[B], the initial production model of the Mark V MJOLNIR armor, enters service in 2551.

November 27

• The Battle of Chi Ceti IV occurs, resulting in a UNSC victory and the death of Sam-034 in 2525.
• The Spartan-IIs are fitted with the MJOLNIR Powered Assault Armor/Mark IV on Chi Ceti IV in 2525.

November 28

• Doctor Luther Mann discovers coordinates to Installation 07 on Trevelyan in 2553.

December

December 1

• UNSC Pillar of Autumn is commissioned into service with the UNSC Navy in 2510.

December 4

• Catherine Halsey begins working at her new laboratory on Reach in 2510.
• Veronica Dare, an Office of Naval Intelligence operative, is born on Actium in 2515.

December 5

• Edward Buck enlists in the UNSC Marine Corps in 2528.

December 7

• The flash clone of John-117 passes away in 2517.

December 10

• Thel 'Vadam, Arbiter and leader of the Swords of Sanghelios, is born on Sanghelios in 2485.
• Catherine Halsey and Franklin Mendez take note of emerging leaders among the Spartan-IIs in 2518.

December 11

• Catherine Halsey works on ways to infiltrate Covenant networks and systems in 2529.
• The Battle of Installation 00 occurs, resulting in the fall of the Covenant in 2552.
• The Flood's infection of the Ark is stopped by the firing of Installation 04B in 2552.
• Thel 'Vadam, John-117, and Cortana leave the Ark for Earth in UNSC Forward Unto Dawn in 2552.

December 12

• Ivan Troy Cole is born on Luna to Inna Volkov and fathered by Preston Cole in 2492.

December 14

• Kurt-051 is debriefed on the SPARTAN-III program and given leadership over its implementation on Onyx in 2531.

December 15

• Carris-137, a Spartan-II, is born on Tribute in 2510.
• Carlo Hoya, a Spartan-IV, is born on Asmara in 2533.
• NOBLE Team undergoes a mandatory psychiatric reevaluation in 2549.

December 19

• The Superintendent AI is created in 2512.
• Nicole-458, a Spartan-II, is born on Mars in 2531.

December 21

• Avery Johnson and Healy arrive at Harvest aboard UNSC Two for Flinching in 2524.

December 23

• Thel 'Vadam returns to Earth in his half of UNSC Forward Unto Dawn in 2552.

December 24

• Catherine Halsey assigns Codename: JACKBOOT to watch the remaining flash clones of the Spartan-IIs in 2517.
• The Battle of Groombridge-1830 takes place, resulting in a UNSC victory in 2530.

December 25

• A Sangheili survivor of the Battle of Groombridge-1830 is interrogated by Preston Cole and Richard Barclay in 2530.

December 27

• 497 recruits for the SPARTAN-III program's Alpha Company arrive at Camp Currahee on Onyx to train under the command of Kurt-051 in 2532.

December 30

• Shadow of Intent is repaired and refitted at a mobile shipyard in 2552.

December 31

• Codename: SURGEON files a report on Preston Cole in 2552.