Standard Operating Brocedure

Standard Operating Brocedure is an achievement in Halo: Combat Evolved Anniversary. It is awarded for completing any 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.

Trivia
The achievement is a play on the term "Standard Operating Procedure."