Master chief petty officer

U.S. Coast Guard
Master Chief
Petty Officer
cap and collar device

U.S. Coast Guard
Master Chief
Petty Officer
insignia

Master Chief Petty Officer is the ninth, and highest, enlisted rate (pay grade E-9) in the U.S. Navy and U.S. Coast Guard, just above Senior Chief Petty Officer. Master Chief Petty Officers are addressed as "Master Chief (last name)" and they constitute the top 1.25% of the enlisted members of the maritime forces.