I wanted to post this in the thread "Your Favorite Hymns" but I can't because it's a Protestant thread.
'Eternal Father, Strong to Save' : the hymn of the U.S. Navy, the Royal Navy, and the Royal Canadian Navy, among others.
I always liked this one; they used to sing this at the Canadian Peace Officer Memorial service that takes place on Parliament Hill in September. That was several years ago, it's probably been replaced by land acknowledgements and aboriginal grunting now.