“.   .   .   Proceed   Underwater   Sound   Laboratories, DISREGARD   THIS   TRANSMISSION,   OUT.” After a message has been completely transmitted, it can be canceled only by another message. For example: “Polk, THIS IS Key, Cancel My Zero Eight Zero Nine Three Zero Zulu, TIME Zero Nine Five Zero Zulu, OVER.” Polk transmits: “Key, THIS IS Polk, ROGER, OUT.” RECEIPT OF A MESSAGE No  message  is  considered  delivered  on  an  R/T circuit until the transmitting station receives a receipt. A receipt is effected by the use of the proword ROGER. The receiving station can transmit a receipt after each message or after a string of messages if there is more than one message to be receipted for. In  a  collective  net,  the  transmitting  station  may determine  that  speed  of  handling  should  be  the  primary consideration. In this case, one station in the net maybe directed to receipt for the message or messages and no other station may answer until instructed to do so. This, however, does not prohibit any station in the net from requesting   repetition. ACKNOWLEDGMENT  OF  R/T  MESSAGES You should not confuse an acknowledgment with a reply or receipt. An acknowledgment is a reply from an addressee   indicating   that   a   certain   message   was received,  understood,  and  can  be  complied  with.  A receipt  means  only  that  the  message  was  received satisfactorily. Only the commanding officer or his or her   authorized   representative   can   authorize A request for acknowledgment is accomplished by use of the word “acknowledge” (not a proword) as the final word of the text. The reply is the proword WILCO. If the commanding officer can acknowledge at once, the communications operator may receipt for the message with   WILCO   because   the   meaning   of   ROGER   is contained in WILCO. If the acknowledgment cannot be returned   immediately,   the   communications   operator receipts  for  the  message  with  ROGER,  and  replies  with WILCO later. The return transmission to a request for an acknowledgment is either ROGER or WILCO; never c o m m u n i c a t i o n s     p e r s o n n e l     t o     s e n d     an acknowledgment. “Polk,   THIS   IS   Key,   Request   Special Communications Training, Acknowledge, OVER.” The  commanding  officer  wishes  to  consider  the  request before acknowledging; the operator sends: “Key, THIS IS Polk, ROGER, OUT.” After  consideration,  the  commanding  officer  of  Polk understands  and  can  comply  with  the  message.  The operator  then  transmits: “Key, THIS IS Polk, WILCO, OUT.” VERIFICATION OF R/T MESSAGES When a receiving station requests verification of an R/T  message,  the  originating  station  verifies  the message   with   the   originating   person,   checks   the cryptography (if the message is encrypted), and sends the correct version. For example: “Key, THIS IS Polk, VERIFY your Zero Eight Zero Nine Three Zero Zulu—SAY AGAIN FROM TO INFO,  OVER.” Key then  transmits: “THIS IS Key, ROGER, OUT.” After  checking  with  the  originating  officer,  Key determines that the portion to be verified is correct as transmitted previously and sends: “Polk, THIS IS Key, I VERIFY My Zero Eight Zero Nine Three Zero Zulu, I SAY AGAIN, FROM TO INFO—FROM Key, TO Polk, INFO, OVER.” Polk receipts for the transmission: “THIS IS Polk, ROGER, OUT.” BREAK-IN  PROCEDURES A station having a message of higher precedence than  the  transmission  in  progress  may  break  in  and suspend that transmission in the following manner: FLASH message—The station should break in at once and transmit the message. IMMEDIATE  message—The  station  may  break  in at once and pass the message. The station may make a preliminary  call  before  transmitting  the  message,  if necessary.  On  a  directed  net,  the  station  must  obtain control approval before transmitting the message. PRIORITY message—The station should use the same procedure as for IMMEDIATE, except that only long  ROUTINE  messages  should  be  interrupted. both.   For   example,   Polk  receives   the   following transmission  from  Key: 2-20