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- (military) Abbreviation of .
- 1996, William Martin, Annapolis, New York: Tom Doherty Associates, published 2010, →ISBN, page 761:
- “You know, I really didn't have much to do with Vietnam. In the summer of 1964, I went to work for the assistant CNO for submarine warfare, Op 02. But that summer, Op 03—that's surface warfare—was developing new ASW strategies.”