Someone I know is using Network Manipulation to get to 5500. If you were to look this man up all games are 0.0 K/D no one om the enemy team. He's on a 40-1 win streak if I knew how to post the games I would. Bungie please take a look into this. Won't say name because don't want people to harrass him.
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If you suspect cheating or abuse, report them via the in game tool or the [url=https://www.bungie.net/en/Help/Troubleshoot?oid=13967]Manual Tool[/url] Bungie's SRT does not review forums for reports.