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Maybe not listening to the COM system is the case, but once you use COMs you can be easily located - source of radio is traceable.
Hand signals are often used in nowadays, because if soldiers see each other it is the safest communication route - silent, hard to track, but still efficient.
COM system in MJOLNIR amrour is probably some kind of radio based technology with strong encryption.
I think the encryption is at level similar to Covenant technology.