damage control circuit and is common to the damage control station and all repair parties. It connects DCC with repair parties II, III, and V. The 3, 4, 5, 6, and even 7JZ circuits are individual repair party circuits connecting each repair party station with its auxiliary station and patrol area. The following are some of the other typical sound-powered  circuits: JA (Captain’s battle circuit) Connects conn, pilot house, interior communica- tions (IC) room, combat information center (CIC), and damage control central (DCC) JV (Maneuvering circuit) Connects pilot house, bridge wings, main engine control, forecastle, fantail, steering gear room, IC room, and DCC 2JV (Engineer’s circuit) Connects all machinery spaces, engineer log room, IC room, emergency diesel generator space, main distribution switchboards, smoke watch, fueling station, and DCC X-40J (Casualty communication circuit) Provides a means of rigging communica- tion lines between vital stations during an emergency  condition The 4MC circuit is the damage control intercom system. It provides two-way communications between DCC and the repair stations. It also provides communications from repair lockers to their respective unit patrol areas by means of remote units powered through the call switches on the repair lockers’ intercom unit. Ship’s service telephones are available for use where they are installed near repair stations. Do not place too much reliance on them, as they may go out of commission early in the action. The ship’s general announcing system is a means of communications, but so many stations are affected that it should only be used when all other methods fail. When all other means of communications have failed, you can use messengers. Train messengers to relay oral orders information without error, even though written messages are more reliable. See Military Requirements for Petty Officer Third Class, NAVEDTRA 12044, for a discussion on messengers. For more in-depth information on sound- powered telephone procedures and the correct terminology, refer to Naval Ships’ Technical Manual, chapter 470; Basic Military Require- ments, NAVEDTRA 12043, chapter 21; and Sound-Powered Phone Talkers Manual, NAV- PERS 14005-A. PERSONNEL CASUALTY CONTROL First aid is the emergency treatment of the sick or injured before regular medical or surgical attention can be obtained. In this section we will only give you basic rules. For more detailed information on treatment, refer to Basic  Military Requirements, NAVEDTRA 12043. First aid does not take the place of proper medical attention. It only provides assistance to the injured until proper medical care can be obtained. The purpose of first aid is to 1. save life, 2. prevent further injury, and 3. preserve resistance and vitality. When providing first aid to injured person- nel, be sure to follow these rules: 1. Keep the patient lying down, head level, until the injuries have been determined. 2. Examine the patient for cessation of breathing, hemorrhage, and evidence of shock. These conditions take precedence in this order over everything else and demand immediate treatment. 3. Remove clothing to determine the extent of the injury. Rip or cut the clothing along the seams, Removing clothing in the normal manner may compound the injury, especially in fractures. Do not remove too much clothing; exposure to cold may bring on the condition of shock. 4. Remain calm. Act quickly but efficiently. Determine which of the patient’s injuries needs attention first, and then determine the proposed course of action. 5. Keep the patient comfortable. This can be done while the patient’s injuries are being treated. A blanket may do the patient as much good as the dressing applied to his wounds. Keep the injured person warm enough to maintain normal body  temperature. 6. Do not allow the patient to see the injury. Assure the patient that the injuries are understood and that good care will be given. Such things are important in keeping a patient calm and preventing shock. 7-18