I like the Navy, they are a  a fleet of waterborne military vessels (watercraft) and its associated naval aviation, both sea-based and land-based.
oh really those have been popular throughout history
yes there are because they are usually a  branch of a nation's armed forces principally designated for naval and amphibious warfare
oh yea that makes sense.
It also involves conducted by surface ships, amphibious ships, submarines, and seaborne aviation
oh really awesome, could you hurry you last bit of info?
The work of navy is divided between riverine and littoral applications, open-ocean applications, and something in between 
thanks for the information friend