Standard Operating Brocedure
From Halopedia, the Halo wiki
Standard Operating Brocedure
Standard Operating Brocedure is an achievement in Halo: Combat Evolved Anniversary. It is awarded for completing any campaign level cooperatively on Normal difficulty. It is worth 10 Gamerpoints. If a player earns the Brovershield or Brohammer achievements without this achievement already earned, they will be unlocked together.
It is represented by two MA5B Assault rifles over the difficulty shield.
Trivia
The achievement is a play on the term "Standard Operating Procedure."
