Herman Melville,
White Jacket; Or, The World on a Man-of-War
“ If comparatively so useless as soldiers, why have marines at all in the Navy? Know, then, that what standing armies are to nations, what turnkeys are to jails, these marines are to the seamen in all large men-of-war. Their muskets are their keys. With those muskets they stand guard over the fresh water; over the grog, when doled; over the provisions, when being served out by the Master’s mate; over the “brig” or jail; at the Commodore’s and Captain’s cabin doors; and, in port, at both gangways and forecastle. ”
