operator should use the appropriate prosigns to correct any portion of the message. After transmission and after a receipt is obtained, a service or abbreviated service message should be used to send any correction. When errors or omissions are noted by the receiving operator, corrections or repetitions are to be obtained before a receipt has been given by the appropriate prosign, or after a receipt has been given by a service or abbreviated service message. NOTE The prosign IMI cannot be used to request repetition after a receipt has been given. A service or abbreviated service message used to obtain repetitions or send corrections is normally assigned a precedence equal to that of the message to which it refers. Corrections sent without a request are preceded by the prosign C with appropriate identifying data where necessary, and transmitted in the same manner as those sent in answer to a request for repetitions, corrections, or verifications. When repetitions of portions of a message containing the call are made, the original call must be repeated in such repetitions except when only one station was called originally. In accomplishing the previously mentioned procedures, use the prosigns AA, AB, WA, and WB. These prosigns are used in service or abbreviated service messages in conjunction with IMI, INT, C, J, and some operating signals. IMI is used by communications personnel to obtain a repetition; J is used by an addressee to obtain a verification and repetition of the entire transmission. Examples: Message C3 DE F5 -P-231010Z MAR 96 -FM F5 -TO C3 -INFO B3 GR9 BT SEAKY-YAMXZ-HINLP-MMIAP-YSBOU- QWJFD-LJGFX-VITZG-IQ BT K To request repetition of the last transmission, C3 would send: F5 DE C3 IMI K To request all before the text, C3 would send: F5 DE C3 IMI AB BT K F5 would send: C3 DE F5 AB BT-C3 DE F5 -P-231010Z MAR 96 -FM F5 -TO C3 -INFO B3 GR9 BT K To request repetition of all before TO, C3 would send: F5 DE C3 IMI AB TO K F5 would send: C3 DE F5 AB TO C3 DE F5 -P-231010Z MAR 96 -FM F5 -TO K To request repetition of the eighth group, C3 would send: F5 DE C3 IMI 8 K F5 would send: C3 DE F5 8-VITZG 4-7