ACP 121 - Communication Instructions General Message Precedence Categories
ACP 121, communication standards
Memorandum from A.M. Mackenzie (RCAP member, MPSC) to Chairman, MPSC, Army member, MPSC pertaining to GCHQ agreement to conform to U.S. message precedence standards.
Hydra Communications - Policy, RG24, 1250-36 Vol. 2, Library and Archives Canada (LAC)
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