STG is the rate, or job, of that person. In this case, it is a Sonar Technician - Surface. They work on the sonar suite of a surface vessel (ie, a ship). The "C" gives that person's rank, which in this case is a Chief Petty Officer. If it was a Senior Chief Sonar Tech, they would be STGCS. If it were a 3rd Class Petty Officer, they would be STG3.
The Sonar Tech rating is actually divided between surface and submarine technicians. STS stand for "Sonar Technician, Submarines", where STG stands for "Sonar Technician, Guns", indicating a surface rate.
It's a job that doesadministrative support for aircraft maintenance
AVCM designates a Master Chief (E-9) Avionics Technician
The SEALs are a part of the US Navy. They use the same ranks as the Navy, enlisted personnel would be petty officers and chief petty officers. The Officer ranks would go from Ensign to Captain.
This is called a "rating" in the Navy. The AT denotes that person's rate, or job. In this case, it is an Aviation Technician. The 3 denotes that person's rank, which in this case, is a 3rd Class Petty Officer.
It is a US Navy rank: Hospital Corsman First Class.
The sea traditions of our British counterparts and that of many other Navies of the world.
I haven't heard that term when relating to the US Navy. But in the Royal Navy SDG is a scubadiver
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An SH is a Ship's Serviceman (Barbers, Shopkeepers, etc.). An SHCS is a Senior Chief (E-8) Ship's Serviceman (read Ship's Serviceman Chief Senior).
It would depend on each individual Naval Commander. IQ's are not based on job titles or ranks.
Ranks for commissioned officers in the US Army, US Marines, US Air Force are as follows:Second LieutenantFirst LieutenantCaptainMajorLieutenant ColonelColonelBrigadier GeneralMajor GeneralLieutenant GeneralGeneralThe five star ranks are reserved for special wartime usage. They are General of the Army, General of the Air Force, and Admiral of the Navy. The Marine Corps and Coast Guard have no equivalent ranks.
FP1 means Pipe Fitter First Class. The 'FP' is the Rate (Pipe Fitter) and the '1' stands for the Rank (Petty Officer First Class).