Standing  alone,  prosign  C  means  “Correct.”  Because it is followed by other information in our example, it means "This is a correct version of the portion of the message indicated.” Another prosign, WA, meaning “word after,” follows certain prosigns (including C) to identify a portion of the text of a plain language message.  In  figure  3-2,  the  portion  of  the  text identified  is  the  word  after  DEBARK,  which  appears in  the  text  as  GROUPS.  Accordingly,  the  final instructions of the message mean “Correct word after DEBARK  to  TROOPS.” Other   prosigns   may   appear   in   the   final instructions. Prosign C may be followed by AB, AA, or WB, instructing the receiving station to correct portions of the text. Prosign B used alone in the final instructions means “More to follow to all stations called." When B is followed by call signs, it means “More to follow to stations indicated.” Prosign G, for repeat back, may be used in the final instructions if, during transmission, its use is deemed necessary. Used alone, G directs all stations to repeat back the message. When G is preceded by a call sign (or signs), its meaning is “Stations whose call sign (or signs) precede G are to repeat back.” In addition to its use  in  the  transmission  instructions  and  final instructions, G may be used in the text of a flashing light message to indicate the addee is to repeat back the previous group sent by the transmitter. Visual transmissions are completed by ending prosigns K or AR. The K means "This is the end of my transmission to you, and a response is necessary.” Ending prosign AR means "This is the end of my transmission  to  you,  and  no  response  is  required  or expected." SERVICE MESSAGE A  service  message  is  one  between  communica- tions personnel and pertaining to any phase of traffic handling,   communication   facilities,   or   circuit conditions.   It   is   prepared   and   transmitted   in plaindress,  abbreviated  plaindress,  or  codress  form. The abbreviation SVC following any security classification or UNCLAS in the beginning of the text, identifies  a  plain-language  service  message. An encrypted service message will always carry a numerical  group  and  will  only  be  identified  as  a service message within the encrypted text. Service messages generally concern messages originated at, destined for, or refiled by that station and normally will be assigned a precedence equal to that of the message to which they refer. Examples of plain-language service messages: 1. Plaindress format: P 031500Z MAR 95 GR10 BT UNCLAS SVC BRIDGE TO BRIDGE INOP COME UP ON TGO BT K 2. Abbreviated plaindress format: BT UNCLAS SVC BRIDGE TO BRIDGE INOP COME UP ON TGO BT 1500Z ABBREVIATED  SERVICE  MESSAGE The  text  of  an  abbreviated  service  message contains only prosigns, operating signals, address designations,  identification  of  messages,  parts  of messages, and amplifying data as necessary. It may be originated  by  operators  and  may  contain  any  of  the components shown in the basic format except that 1. The long break is used only if the date-time group/time group is used; and 2. The date time group/time group is to be employed only when it is necessary to indicate the time at which the message was originated or when it is considered that further reference may be made to the message. Examples of abbreviated service messages: 1. INT ZDK NKZO 062222Z MAR 95 K 2. Abbreviated plaindress format: BT INT ZDK NKZO 062222Z MAR 95 BT 2300Z K 3. Plaindress format: P 062323Z MAR 95 GR 6 BT INT ZDK NKZO 062222Z MAR 95 BT K ABBREVIATED PLAINDRESS MESSAGES Operational   requirements   for   speed   of handling—contact  reports,  for  example—may  dictate the abbreviation of plaindress message headings. At such times, any or all of the following may be omitted from  the  heading:  precedence,  date,  DTG,  and  group count. If the DTG is omitted, a time group must be in the  ending  procedure  components. CODRESS MESSAGES A codress message is one in which the entire address, originator and all addressees except when the address  indicating  groups  are  used,  is  encrypted within  the  text.  The  heading  of  such  a  message contains   only   information   necessary   to   enable 3-10