What does SP3 stand for?

MLA style: "SP3." Acronym Finder . 2012. AcronymFinder.com 3 Jun. 2012 <a href="http://www.acronymfinder.com/Steam-Propulsionman-Third-Class-(USN-rating)-(SP3).html">http://www.acronymfinder.com/Steam-Propulsionman-Third-Class-(USN-rating)-(SP3).html
Chicago style: Acronym Finder . S.v. "SP3." Retrieved June 3 2012 from <a href="http://www.acronymfinder.com/Steam-Propulsionman-Third-Class-(USN-rating)-(SP3).html">http://www.acronymfinder.com/Steam-Propulsionman-Third-Class-(USN-rating)-(SP3).html
APA style: SP3. (n.d.) Acronym Finder. (2012). Retrieved June 3 2012 from <a href="http://www.acronymfinder.com/Steam-Propulsionman-Third-Class-(USN-rating)-(SP3).html">http://www.acronymfinder.com/Steam-Propulsionman-Third-Class-(USN-rating)-(SP3).html

Steam Propulsionman Third Class (USN rating)

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Sky Sports 2 (UK TV channel) Steam Propulsionman Second Class (USN rating) Super Power Projection (World Human Dvelopment Center) Spatial Planning to Strategic Projects (architecture research project; Catholic University; Leuven, Belgium) Single-Pole Double-Throw (switch) Security Protocol 3 Serum Protein 3 (genetics) Service Pack 3 Sky Sports 3 (UK TV channel) Standard Product 3 (global positioning systems)		Short-Period Three Component Single Pole Three Throw (switch) Security Protocol Layer 4 Specialist, Grade E4 (US Army) Telephone Zone Controller Single-Pole Four-Throw (switch) Service Pack 5 (Microsoft Windows NT 4.0) Specialist 5th Class Standard and Poor's 500 (stock index) Sphere-Packing Bound of 1959 (decoding error probability)