From Halopedia, the Halo wiki
3 Echo 57 was ordered to defend Sword Base during the Fall of Reach. When defensive forces were deemed insufficient to hold off the Covenant, Noble Team was sent in to reinforce them. When Kat-B320 and SPARTAN-B312 arrived, 3 Echo 57 and his fireteam were in a heavily damaged M831 Troop Transport Warthog, under heavy assault from two Type-26 Wraiths and attempted to retreat to the base. They were killed by one of the Wraiths before they could make it.
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