Question about a different name for spies, I am writing a book?

I am writing a book about spies and I have decided that spies is a little over done and cheesy. Instead I might call the organization M.I.S.S.I.O.N. and the agents Missionaries. The organization name stands for something, I have most of it picked out but I have about two holes, so if you could make up any serious names for mission to stand for that would be great.
Thanks so much!!!
 
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