Most radio communications create a radio subtitle in the lower left of the screen. Some chatter type communications ("Cover Me!" etc) do not create subtitles (or use the radio) and this is fine.

However there are some useful radio comms that do not produce subtitles:

• Ready/Done - reported by AI when they finish assigned task. Subtitles required to identify who is ready, especially if task takes a long time, such as ordering AI to move to distant location.