How to ask someone to be a godfather

Hey gals :)
I don't know if that's the right place to post this but how could we ask a friend of ours who lives far away to be our daughters godfather. He served with my husband for years in the army and got out because of some bad stuff that happened to him but he is the only one we would trust to take care of  our daughter if something would happen..
Thanks in advance 

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