Protector medal

The Protector medal is a multiplayer medal that is awarded to a player who saves a teammate from death by killing the teammate's attacker.
Below is a Bungie weekly update in which the Protector medal was revealed, delving into detail on the mechanics:
" In "Protector"’s case, after a certain amount of damage has been done to a Player A by Player B, if Player C kills Player B, he earns the Protector Medal. Player A receives a message (in the same place as messages like "You sniped JimmyAwful") that says Player C saved your life. "Bungie.net: Bungie Weekly Update: 07.09.10
==Gallery==
ProtectorMedal.jpg|A player being awarded the medal while in a Slayer game on Reflection.
Halo Reach Protector Render.png|The medal in Halo: Reach.
==Sources==