What does OP stand for?

MLA style: "OP." Acronym Finder . 2012. AcronymFinder.com 2 Jun. 2012 http://www.acronymfinder.com/Ordnance-Publication-(OP).html
Chicago style: Acronym Finder . S.v. "OP." Retrieved June 2 2012 from http://www.acronymfinder.com/Ordnance-Publication-(OP).html
APA style: OP. (n.d.) Acronym Finder. (2012). Retrieved June 2 2012 from http://www.acronymfinder.com/Ordnance-Publication-(OP).html

Ordnance Publication

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Oral Production (test) Orbit Prediction Orbiter Payload Order of Preachers (Roman Catholicism; Dominican) Order of Precedence Order of the Pelican (Society for Creative Anachronism) Order Point Order Processing Ordinis Praedicatorum (Latin: Order of Preachers) Ordnance Pamphlet		Ordo Praedicatorum (Latin: Order of Preachers; formal name of Dominicans, a Catholic religious institution) Organized Play (gaming) Organophosphate (insecticide) Organophosphorus (pesticide) Orienteering Problem Original Pack (pharmacology) Original Poster Original Poster (internet newsgroups and message boards) Original Production Originating Party