What aspect of communication is emphasized regarding radio usage?

The emphasis on calm delivery in radio communication is crucial due to the nature and limitations of the medium. Radio communication often takes place in high-pressure environments where quick clarity is necessary. A calm delivery helps to keep commands clear and ensures that messages are conveyed effectively without confusion. This is particularly important in security contexts, where the ability to communicate under duress can significantly impact the outcome of a situation.

In contrast, expressive language, technical jargon, and the use of sarcasm or humor can introduce ambiguity or misunderstanding. While a certain level of expressiveness can enhance communication, the primary goal in emergency or security-related communication is to maintain clarity and composure, allowing for immediate and appropriate responses from team members.