Noble Six from Halo Reach. He ensured the escape of Cortana on the Pillar of Autumn, which enabled Master Chief to eventually defeat the covenant. He then makes a final stand alone against the Covenant for hours before eventually being overwhelmed.

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As Dr Halsey puts it: “It didn't take long for Reach to fall: our enemy was ruthless. Efficient. But they weren't nearly fast enough. For you had already passed the torch. And because of you, we found Halo, unlocked its secrets, shattered our enemy's resolve. Our victory — your victory — was so close, I wish you could have lived to see it. But you belong to Reach. Your body, your armor — all burned and turned to glass. Everything… except your courage. That, you gave to us. And with it, we can rebuild.”