Carter's Helmet Clear a Campaign mission on Legendary without dying.

Emile's Helmet Earn a Bulltrue medal in either Multiplayer or Firefight Matchmaking.

Jorge's Helmet Earn a Killtacular in Multiplayer Matchmaking.

Jun's Helmet Kill 100 enemies in a row without dying in either the Campaign or Firefight.

Kat's Helmet Avenge a teammate's death in Multiplayer Matchmaking.