The 405th, out of Diego Garcia, fought in the 1st battle of New Mombasa and toke heavy casualties, fought along side the master chief during the 1st battle of New Mombasa, fought at delta halo with severe casualties, fought at the delta halo quarantine zone with severe casualties, a few remaining 405th members fought at the battle of high charity along side master chief 117 and presumed KIA, the fate of the company is unknown as of this time..........
UNSC Marine Corp Infantry Division: STATUS-unknown
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IDK why Adam choose the 405th but it does sound fitting in a way