A chief petty officer is a senior non-commissioned officer in many navies and coast guards.Canada"Chief petty officer" refers to two ranks in the Royal Canadian Navy. A chief petty officer 2nd class (CPO2) (premier maître de deuxième classe or pm2 in French) is equivalent to a master warrant officer in the Army and Air Force, and chief petty officer 1st class (CPO1) (premier maître de première classe or pm1) is equivalent to a chief warrant officer in the Army and Air Force. In spoken references, chief petty officers may be addressed as "chief" but are never addressed as "sir".United KingdomIn the Royal Navy, the rank of chief petty officer comes above that of petty officer and below that of warrant officer class 2. It is the equivalent of colour sergeant in the Royal Marines, staff sergeant in the Army, and flight sergeant in the Royal Air Force.United StatesChief petty officer is the seventh enlisted rate in the U.S. Navy and U.S. Coast Guard, just above petty officer first class and below senior chief petty officer. Chief petty officers are classified as senior non-commissioned officers. The grade of chief petty officer was established on April 1, 1893 for the U.S. Navy. The U.S. Congress first authorized the U.S. Coast Guard to use the promotion to chief petty officer on 18 May 1920.