From Halopedia, the Halo wiki
This article is about Halo: Reach medal. For the Halo 4 medal, see Rejection (Halo 4 medal).
Rejection is a Halo: Reach multiplayer medal. Depicted as a gold diamond superimposed by a blue shield and brass padlock, the medal is earned by using Armor Lock and surviving a subsequent assault that would have otherwise been fatal, i.e. a plasma mortar launched from a Type-26 Wraith. It was revealed alongside two other medals in Bungie's 07/09/10 weekly update. This medal is referred to as Denied in Halo: The Master Chief Collection as the Halo 4 Rejection medal was already in the game by the time Halo: Reach added to the collection.