USN PO1 or Petty Officer First Class, E-6, is equivalent to an Army SSG, or Staff Sergeant, E-6. The only difference is that Army SSG's are considered SNCO's or Staff Non-Comissioned Officers. Petty Officers 3rd, 2nd, and 1st class are not.
As per official US Navy documents, the answer is that no "first chief petty officer" exists. Nearly all personnel rated as petty officers first class since at least 1885 were automatically promoted to chief petty officer in 1893. These promotions occurred simultaneously, making the first chief petty officer impossible to determine.
Could be one of three ratings. CM1---Mechanic Petty Officer 1st Class; CM1---Construction Mechanic Petty Officer 1st Class; CM1----Carpenter's Mate Petty Officer 1st Class
Cook petty officer third class
The Navy (and Coast Guard) are different from other services. We have a Rate (similar to Rank in other branches) and a Rating (similar to MOS). Your Rate is your pay-grade, E-1 is a Seaman Recruit, E-6 is a Petty Officer 1st Class, etc... Your Rating is your job, ET is an Electronics Technician, and FT is a Fire Control Technician, for example. Specific to your question: there are two broad classes of Petty Officers, non-commisioned officers and senior non-commisioned officers. E-4 (Petty Officer 3rd Class), E-5 (2nd Class), and E-6 (1st Class) are non-commissioned officers and you can formally address them in three ways: # Simply as Petty Officer, # An abbreviated form of address such as PO3 (for 3rd Class) or PO1 (for 1st Class), # By combining the Petty Officers Rate and Rating into a single form of address; for example a Machinists Mate who is an Petty Officer 3rd Class could be addressed as MM3, or a Boatswains Mate who is a Petty Officer 1st Class could be addressed at BM1. If you know a Petty Officers last name, you can add it to the greeting as well, i.e., Petty Officer Smith, or MM3 Smith. Addressing a Chief Petty Officer is easier. A E-7 is a Chief Petty Officer, a E-8 is a Senior Chief Petty Officer, and a E-9 is a Master Chief Petty Officer. In practice you would refer to them as Chief, Senior Chief, and Master Chief, respectively. Like the more junior Petty Officers, you can combine a Chief's address with the last name, i.e. Chief Smith, or Master Chief Smith.
Storekeeper-Petty Officer Second Class
Yes a HM3 is a third class petty officer. HM denotes that the person's rate (or job person is assigned) in this case it is a hospital corpsman. The Number following shows his pay grade. HM2 is a second class petty officer and HM1 first class petty officer. A third class petty officer is an E-4 which is the equivalent to a Marine Corporal which is also an E-4.
In the US Navy, the ranks of "Seaman Recruit", "Seaman Apprentice" and "Seaman" are junior to the rank of Petty Officer 3rd Class. In increasing rank are Petty Officer 2nd Class, Petty Officer First Class and Chief Petty Officer. So, yes, any of the Petty Officer ranks are higher than any of the Seaman (or Airman or Fireman) ranks.
First Class Petty Officer, and a Machinist's Mate (a job rating). The MM stands for Machinist's Mate, and the "1" denotes that the person is a First-Class Petty Officer.
Petty Officer is abbreviated PO and the rank is usually included, 1st Class, 2nd Class, or 3rd Class Petty officer. E-4 is a 3rd Class Petty Officer, or PO3 E-5 is a 2nd Class Petty Officer, or a PO2 E-6 is a 1st Class Petty Offcier, or a PO1 CPO is a Cheif Petty Officer or an E-7 SCPO is a Senior Cheif Petty Officer, or an E-8 MCPO is Master Cheif Petty Officer, or an E-9 MCPON is Master Cheif Petty Officer of the Navy also E-9
Cryptologist Technician First Class. A first class petty officer is paygrade E6,
The rank of Corporal and Leading Seaman are equivalent. The next level up is Sergeant (army) Petty Officer (navy). Although the American Navy turfs in a few extra pay grades under the Petty Officer rank. On the other hand the British Navy skips the rank of Petty Officer 2nd Class and goes right to Petty Officer 1st Class from Leading Seaman. Petty Officer 1st Class is equivalent to Warrant Officer in the Army. Confused?
petty officer first class
petty officer first class
petty officer first class
First Class Petty Officer is the Rank; the paygrade is E-6.
There were many more military positions in Colonial times. The go from, Crewman Apprentice, Crewman, Specialist, Petty Officer Second Class, Petty Officer First Class, Chief Petty Officer, Master Chief Petty Officer, Warrant Officer, Ensign, Junior Lieutenant, Lieutenant, Captain, Major, Colonel, Commander, Rear Admiral, and Admiral.
HM3, or Hospitalman Third Class, is an enlisted rank in the United States Navy. It is equivalent to the rank of E-4, or Petty Officer Third Class.