According to Article 3.3 of MARPOL 73/78, that Convention does not apply to warships, naval auxiliary or other ships owned or operated by a State and used only for government non-commercial services.
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New version applies from 20/05/2007.
21 provisions change.
Later versions: 20/04/2009, 21/12/2009, 20/07/2012.
Recital 8 changes in this version: compare with the current text.