Known by the SEAL's as on of the "Boat Guys", an SB2 is one of the Navy's Special Boat Operators, who are part of the SWCC (Special Warfare Combat Crewmen) community. An SB2 is a Special Boat Operator 2nd Class (2nd Class Petty Officer).
SB's, like all SWCC's, are responsible for SEAL insertion and extraction where high speed boats and other watercraft are required. They are highly trained in boat operation, navigation, engineering, first aid, weapons, and pretty much anything else necessary to operate in extremely hostile environments.
It does not stand for anything. The word navy is derived from the Latin word navigia meaning ships.
The initials 'MN' stand for Merchant Navy. Likewise, the initials RN stand for Royal Navy.
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The Chevy SB2 is the first purpose designed and built NASCAR motor GM ever made. It was used right up till 2008 in the nationwide series. The SB2 has now been fully replaced with the RO7, but is still widely used in drag racing and other motorsports.
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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
SECNAV is an acronym for Secretary of the Navy
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Repair Parts Petty Officer
Red Black and Navy Blue