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ACP 125 facts for kids

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ACP 125 is the short name for Allied Communications Publication 125: Communications Instructions—Radiotelephone Procedures, developed and published by the Combined Communications Electronics Board, for use by the Five Eyes nations and the rest of NATO. According to the latest version,

"The aim of ACP 125 is to prescribe the voice procedure for use by the armed forces of Allied nations on secure and non-secure tactical voice nets. Its purpose is to provide a standardized way of passing speech and data traffic as securely as possible consistent with accuracy, speed and the needs of command and control."

The standard defines the procedures for communicating by voice over two-way radio, and has served as the basis for radio communications procedures for many non-military organizations, as well as numerous U.S. government organizations, including the United States Department of State and the Civil Air Patrol.

First published as ACP 125(A) in about 1951, the current version is ACP 125(G), published in 2016. The standard itself is ACP 125, with the letter in parenthesis indicating the major revision level. There are at least two supplements, including:

  • ACP 125 U.S. SUPP-1: HF Air-Ground Radiotelephone Procedures U.S. Supplement 1 to ACP 125(B)
  • ACP 125 (US SUPP-2): Radiotelephone Procedures for the Conduct of Artillery and Naval Gunfire (U)

International use

Although the standard is designed for use by all NATO countries, especially when operating in conjunction with each other, some efforts have been made in the past to translate the procedure words into the native language of member countries. For example, NATO memo SGM-623-56 from 1956, French Equivalents to English Expressions Used in ACP 125(B), includes the following table of prowords:

Equivalent Prowords
English French
ACTION ACTION
ALL AFTER TOUT APRES
ALL BEFORE TOUT AVANT
BREAK SEPARATION
CORRECTION CORRECTION
DISREGARD THIS TRANSMISSION ANNULEZ CETTE TRANSMISSION
DO NOT ANSWER NE REPONDEZ PAS
EXECUTE EXECUTEZ
EXECUTE TO FOLLOW PREPAREZ-VOUS A EXECUTER
EXEMPT EXCEPTE
FIGURES CHIFFRES
GROUPS GROUPES
INFO INFO
I READ BACK JE COLLATIONNE
I SAY AGAIN JE REPETE
I SPELL J'EPELLE
I VERIFY VERIFICATION
MESSAGE FOLLOWS PRENEZ MESSAGE
NUMBER NUMERO
ORIGINATOR ORIGINE
OUT TERMINE
OVER PARLEZ
READ BACK COLLATIONNEZ
RELAY (TO) TRANSMETTEZ (A)
ROGER RECU
SAY AGAIN REPETEZ
SILENCE SILENCE
SILENCE LIFTED SILENCE SUSPENDU
SPEAK SLOWER PARLEZ LENTEMENT
THAT IS CORRECT CORRECT
THIS IS ICI
TIME GROUPE HORAIRE
UNKNOWN STATION STATION INCONNUE
VERIFY VERIFIEZ
WAIT ATTENDEZ
WAIT OUT ATTENDEZ TERMINE
WILCO APERCU
WORD AFTER LE MOT APRES
WORD BEFORE LE MOT AVANT
WORDS TWICE LES MOTS DEUZ FOIS
WRONG ERREUR

See also

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