I thought you might be interested in looking at How to turn off any automated AI speaking for player-controlled units? Without breaking the capability for players to use the radio..
https://forums.bohemia.net/forums/topic/215361-how-to-turn-off-any-automated-ai-speaking-for-player-controlled-units-without-breaking-the-capability-for-players-to-use-the-radio/?do=findComment&comment=3275966
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