 Depending on the ship and crewing, the steward's assistant may be responsible for other cleaning duties, such as stairways and passageways, laundry rooms, refrigerated spaces, storerooms, linen lockers, the ship's office, the radio room and any other areas assigned to the steward's department.An steward's assistant may be responsible for making up bunks and cleaning rooms, toilets, and showers of officers and others.In order to be occupied as an steward's assistant in the United States Merchant Marine, a person has to have a Merchant Mariner's Document issued by the United States Coast Guard.