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COMDINST numbers are grouped by topic, so you identify a manual by its numeric range rather than by a random label. The Telecommunications Manual falls in the M 2000 series, which in this catalog is the block assigned to communications topics and information systems. That makes COMDTINST M 2000 the correct mapping for telecommunications policies and procedures.

The other numbers in that list belong to different subject areas, so they don’t describe the Telecommunications Manual. When in doubt, a quick check of the COMDTINST catalog or its table of contents confirms the subject area for each M-series entry, and you’ll see telecommunications align with the 2000s.