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Codenamed Sierra10852, this person was an ONI agent who assassinated Colonel Herzog after he threatened to expose Major Standish for keeping the Deep-Space Artifact from his superiors. Sierra10852 was executed for the assassination, however, it is unknown if this was Standish or one of his underlings.[1]


  • Following the pattern of the codenames featured in the sub-chatter record, "Sierra" (S in the phonetic alphabet) is the last initial and "10852" is the second string of numbers in their serial number.


  1. Halo Graphic Novel, Page 122
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