BEFORE BLOOD GULCH (B.B.G.)
SPANNING 2519 TO 2550

2519 OR 32 B.B.G. — 32 YEARS BEFORE BLOOD GULCH

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• blue team (the master chief version) is formed
• wash is born

2521 OR 30 B.B.G. — 30 YEARS BEFORE BLOOD GULCH

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• maine is born

2525 OR 26 B.B.G. — 26 YEARS BEFORE BLOOD GULCH

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• the spartan-iis are subjected to biological augmentations; only 30 out of the 75 children conscripted into the program survive the process
• the human-covenant war begins; the spartan-iis are now active
• green hills and second base are glassed by the covenant; harvest is partially glassed

2536 OR 15 B.B.G. — 15 YEARS BEFORE BLOOD GULCH

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• maine's planet in kepler-62 is glassed by the covenant

2537 OR 14 B.B.G. — 14 YEARS BEFORE BLOOD GULCH

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• maine enlists with the unsc at 16; wash enlists at 18
• operation: prometheus; though the mission is a success, all 300 spartan-iiis of alpha company are killed and beta company is formed in its place
• battle of leonis minoris; 2/3 worlds in the leonis minoris system are glassed by the covenant

2544 OR 7 B.B.G. — 7 YEARS BEFORE BLOOD GULCH

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• project freelancer is cleared for funding

2546 OR 5 B.B.G. — 5 YEARS BEFORE BLOOD GULCH

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• dr. leonard church receives the unsc smart ai "alpha" for project freelancer
• maine joins project freelancer at 24/25
• wash joins freelancer at 27
• alpha-nine is formed, led by future spartan-iv edward malcolm buck
• sargasso and new llanelli are glassed by the covenant

2547 OR 4 B.B.G. — 4 YEARS BEFORE BLOOD GULCH

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• dr. leonard church discovers a way to split the alpha in many pieces
• skopje is glassed by the covenant
• season 9

2548 OR 3 B.B.G. — 3 YEARS BEFORE BLOOD GULCH

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• maine loses his voice; carolina gives him sigma
• the battle of meridian begins
• season 10

2549 OR 2 B.B.G. — 2 YEARS BEFORE BLOOD GULCH

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• maine's current canon point (season 10; note: maine is pre-defection and pre-badass head tat)
• maine is 28-years-old
• maine defects after taking iota and eta from carolina; washington is assigned epsilon; carolina and texas are mia; connecticut is killed after defecting
• the spartan-ii program is announced to the general public
• cortana is created
• arcadia and paris iv are glassed by the covenant

2550 OR 1 B.B.G. — 1 YEAR BEFORE BLOOD GULCH

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• york leaves freelancer
• minab is glassed by the covenant
• season 10? i think? a lot of shit happened in only one season

AFTER BLOOD GULCH (A.B.G.)
SPANNING 2551 TO 2556

2551 OR 0 A.B.G. — THE YEAR OF ALPHA'S ARRIVAL AT BLOOD GULCH

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• wash is reassigned as a recovery agent
• florida is accidentally killed by the alpha
• the battle of meridian ends; meridian is glassed by the covenant
• season 1

2552 OR 1 A.B.G. — 1 YEAR AFTER ALPHA ARRIVES AT BLOOD GULCH

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• battle of installation 04
• battle of installation 05
• battle of installation 00; the human-covenant war ends
• reach, new jerusalem, and coral are glassed by the covenant; earth and tribute are partially glassed
• noble team is killed on reach; most of red team (spartan version) are also killed on reach
• york is killed by wyoming in combat; wyoming and north dakota are both kia; agent maine, acting now as the meta, retrieves theta from north's body and gamma from wyoming's body
• seasons 2-5 + out of mind and recovery one

2553 OR 2 A.B.G. — 2 YEARS AFTER ALPHA ARRIVES AT BLOOD GULCH>

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• south dakota is kia
• the meta retrieves omega, beta, and delta
• washington makes contact with the reds and blues of blood gulch
• washington retrieves epsilon from freelancer hq; the blues take epsilon into their possession for safekeeping
• the alpha, omega, beta, theta, delta, gamma, iota, eta, and sigma are destroyed at freelancer hq
• wash is arrested by the unsc
• spartan-ivs are now active
• master chief petty officer john-117 is declared mia
• the treaty of 2552 is ratified
• season 6

2554 OR 3 A.B.G. — 3 YEARS AFTER ALPHA ARRIVES AT BLOOD GULCH

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• washington is released from the custody of the unsc on orders to retrieve epsilon; the meta goes with him
• what follows is basically an entire season of wash and maine playing bad cop/even worse cop
• epsilon splits itself into two parts
• maine is chucked off a cliff and assumed kia; he's 33-years-old
• wash officially joins the blues because why not i guess
• seasons 7-8

2555 OR 4 A.B.G. — 4 YEARS AFTER ALPHA ARRIVES AT BLOOD GULCH

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• carolina reappears and joins the reds/blues
• season 8??? season 9??? one of those!

2556 OR 5 A.B.G. — 5 YEARS AFTER ALPHA ARRIVES AT BLOOD GULCH

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• dr. leonard church kills himself
• the reds, blues, carolina, and wash all land on chorus and shit happens
• epsilon goes apeshit and is probably gone for good i think i dont know
• maine's armor is recovered
• wash is 37-years-old
• former oni agent jameson locke is recruited to the spartan-iv program
• seasons 11-13; wash's current canon point

NOTE: This timeline was created specifically for both Wash and Maine (traitorous) at forbarrayar, but should be generally applicable.

Most dates and years calculated from what's known about RvB's canon timeline with major Halo universe events for reference, namely the end of the Great War ( here taken to be 2552 rather than the 2553 ) and the Battle of Leonis Minoris. Since RvB has never been able to perfectly fit with Halo's, there are some inconsistencies, but most things should be internally consistent.