and exempted addressees. Plain language address is the pharse used to denote the format and ordinary language spelling of command short titles and geographical locations used in message addresses. The NTP 3 SUPP-1(K) and the United States Military Communications Electronic Board (USMCEB) publication list the authorized plain language addresses for naval messages. The FROM, TO, INFO lines of a naval message contain plain language addresses. Messages must have only one originator address but may have unlimited action and information addressees. Some messages may be addressed to activities listed under collective address designators (CADs) or address indicating groups (AIGs). Only authorized activities may originate these multiple- address messages. However, personnel responsible for determining whether action is required on incoming message must know which CADs and AIGs include their command. Collective Address Designator. —Collective address designators are single-address, alphabeti- cally sorted, common-interest groups. Each CAD represents a predetermined set of activities linked by an operational or administrative chain of command. Some examples of CADs are NAV- FOREUR, NAVFORJAPAN, and CRUDES- FORSEVENTHFLT. Address Indicating Group. —Address  indi- cating groups represent predetermined lists of specific and frequently recurring combinations of action and information addressees or both. AIGs are identifed by numbers that expedite message processing in both administrative and tele- communications channels and may pertain to the following: Alerts,  air  defense  warnings,  and operational or emergency actions Severe weather or destructive storm warnings Logistical transactions or reports Movement  reports TEXT COMPONENTS. —The text com- ponents of a message consist of the classification line, passing instructions line, subject line, reference line, and the basic text or message. Classification line. —The classification line of the security classification and the standard subject identification code (SSIC). When applicable, the line also includes special-handling markings. The security  classification  or  the  designation UNCLAS, for unclassified information, must appear on all messages. Certain types of messages require special- handling in addition to that provided by the security classification. Markings that indicate special-handling requirements (for example, SPECAT,  LIMDIS,  PERSONAL  FOR)  are placed in the classification line immediately following the security classification. NTP 3(H) contains specific instructions concerning special- handling markings. The standard subject identification code is the last element of the classification line. It is required on all Navy-orginated messages, except as noted in NTP 3(H). The SSIC is used as one method for the determination of internal message distribution. Be careful to select the SSIC that most completely and accurately corresponds to the message subject matter. Passing Instructions Line. —Passing instruc- tions, when applicable, are located on the line below the classification line. Passing instructions consist of office codes, symbols, or names. However, passing instructions may be used on naval messages only as authorized by NTP 3(H). Subject Line. —The subject line begins on the line following the classification line or the passing instruction line when it is used. Message subject lines indicate to the reader the basic contents of the messages text. You may omit the subject line for tactical messages when the following occurs: 1. 2. 3. It will cause otherwise unclassified message to be classified. It will noticeably increase the length of a short  message. The subject is readily apparent in the first line of the text. Reference Line.  —Reference lines are used as alternatives to the repeating of lengthy references within the text of the message. You may use any identifiable  document,  all  messages,  and telephone conversations in a message as long as the reference line is clear and specific. Letter each reference  consecutively. 2-35