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WW1 RN Ship Ratings?

On a Sailors service records (enclosed) i have it list' the ships he served on and then in brackets a word i can't make out, then under "Rating" 2 abbreviations, CMB which i think is "Coastal Motor Boat" and then CMM which i've no idea what it means.
Anyone able to interpret these? It's the one at the bottom Stephen Henry Excell.


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