Can somebody back me up on this because a few others don't seem to believe me?
My argument:
The SPARTAN I Program, AKA ORION Project, was aimed at countering insurgency operations. Like the SPARTAN II and III Programs, the members were given biochemical augmentations. When the program was shut down, the soldiers with those augmentations were said to have "Boren's Syndrome", which was simply a cover up. Avery Johnson was a member of the SPARTAN I program and those augmentations are the reason he was immune to the Flood.
Their argument:
The SPARTAN Is were those from ancient Greece and Boren's Syndrome is caused by radiation from Covenant weapons.
I'm only posting this to prove a point. Am I right or am I wrong?
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