From Halopedia, the Halo wiki
In Outskirts if you kill an American marine, one of the others might say "you killed Parsons!". This is very rare and I only heard a marine say it when I threw a grenade and killed 'Parsons' but I have heard one say that on another occasion as well. —This unsigned comment was made by User: Bontakun117 (talk • contribs). Please sign your posts with ~~~~!