The 3 is the rank of the sailor, indicating that they are an E-4 or 3rd Class Petty Officer. SB is their specialty and it stands for Navy Special Boat Operators (SB). They are also known as SWCC, which is Special Warfare Combatant-craft Crewmen. They operate the special boats used by SEAL teams and gun boats used in river warfare.
It does not stand for anything. The word navy is derived from the Latin word navigia meaning ships.
CYA in the Navy, like most places, stands for "Cover Your A$$.
Navy beans
The navy blue wheel that appears in the Indian Nation Flag Stand for Religion
The symbol for the antimonous ion is Sb3+, indicating that it has a +3 charge.
SECNAV is an acronym for Secretary of the Navy
Repair Parts Petty Officer
Navy, Army & Air Force Institutes
MEW - Metalsmith (Welder)
Master Chief Petty Officer Of The Navy
Red Black and Navy Blue
Tactical Supervising Officer