The engineer port repair ship crew is composed of specialists. The classifications include master mechanic, electrician, boatswain, diver, radio operator, Diesel mechanic, welder, blacksmith, cook, and able-bodied seaman. The crew consists of commissioned officers, warrant officers, and enlisted men. (See fig. 3.) 5. DUTIES OF PERSONNEL. =a. General.= Members of the crew are assigned to one of four sections: deck, engine, operating, or headquarters. However, all personnel must be trained to assist in performing tasks besides those specifically assigned. For instance, additional deckhands may be needed in bad weather or in making fast to a wharf, or extra riggers may be required to move heavy materials or load or unload equipment or supplies. =b. Ship’s master.= The ship’s master is responsible for everything done by his ship and crew. He must be a technical specialist as well as a military leader. His principal responsibilities are: (1) Safe navigation and efficient handling of his ship at all times. (2) Direction of operations in carrying out the ship’s mission. (3) The condition and appearance of his ship. (4) Administrative duties and the discipline and morale of his crew. =c. Deck section.= Crew members of the deck section are primarily responsible for: (1) Sea-detail duties specified by the deck officer. (2) Outward appearance of the ship. This includes painting, rust prevention, and general ship-shape condition. (3) Handling lines in mooring and docking. (4) Navigation of the ship. (5) Weighing or dropping anchor. =d. Engine section.= The engine section operates, maintains, and repairs the ship’s main and auxiliary engines, compressors, pumps, generators, motors, and electrical systems. =e. Operating section.= The personnel of the operating section are under the supervision of the salvage officer and are responsible for: (1) All diving operations, including underwater inspections, construction, repairs, and demolitions. (2) Operation and maintenance of machine, welding, blacksmith, pipe, and carpenter shops. (3) Clearing harbor areas of debris and obstructions and restoring navigational aids. =f. Headquarters section.= This section is responsible for general administrative, housekeeping, and radio-communication duties aboard ship. These duties include operation and supply of the ship’s galley and cold-storage compartments, and supply and storage of all food, silverware, clothing, and linens. =g. Attached armed guard.= A Navy gun crew operates and maintains the ship’s antiaircraft (AA) armament. (See par 7e.) Each member of the gun crew takes his turn at standing watch. 6. SHIP MAINTENANCE AND REPAIR.