Chief Petty Officer

Chief Petty Officer is the seventh enlisted rank in the UNSC Navy and is a non-commissioned officer. It is equal in rank to Gunnery Sergeant in the UNSC Marine Corps, Sergeant First Class in the UNSC Army, and Master Sergeant in the UNSC Air Force. It is directly above Petty Officer First Class and below Senior Chief Petty Officer.

I n informal settings, Chief Petty Officers are typically called "Chief."

In the UNSC Navy, enlisted personnel are referred to by their rating and rate (rank). Mentioned    ratings at the same pay grade as Chief Petty Officer are listed below:
 * Tech Chief
 * Personnel: Thom Shepard

Air Force

 * Airman Basic
 * Airman
 * Airman First Class
 * Senior Airman
 * Staff Sergeant
 * Technical Sergeant
 * Master Sergeant
 * Senior Master Sergeant
 * Chief Master Sergeant
 * Command Chief Master Sergeant
 * Chief Master Sergeant of Air Force

Army

 * Private
 * Private First Class
 * Specialist
 * Corporal
 * Sergeant
 * Staff Sergeant
 * Sergeant First Class
 * Master Sergeant
 * First Sergeant
 * Sergeant-Major
 * Command Sergeant-Major
 * Sergeant Major of the Army

Marine Corps

 * Private
 * Private First Class
 * Lance Corporal
 * Corporal
 * Sergeant
 * Staff Sergeant
 * Gunnery Sergeant
 * Master Sergeant
 * First Sergeant
 * Master Gunnery Sergeant
 * Sergeant-Major
 * Sergeant-Major of the Marine Corps

Navy

 * Crewman Recruit
 * Crewman Apprentice
 * Crewman
 * Petty Officer Third Class
 * Petty Officer Second Class
 * Petty Officer First Class
 * Chief Petty Officer
 * Senior Chief Petty Officer
 * Master Chief Petty Officer
 * Command Master Chief Petty Officer
 * Force Master Chief Petty Officer
 * Fleet Master Chief Petty Officer
 * Master Chief Petty Officer of the Navy