These rules are guidelines, made with no specific situation in mind. A situation may require that these rules are broken. With all things, apply common sense.
For a more detailed look at how radio communications should be handled, see radio procedure.
Com-1 is used for close level squad communications. If working closely with a group of others, in the same rough area, you should be on the same Com-1 as them.
One squad should always be using Kilo (127) on Com-1.
Com-2 is for specialist communications. NCOs, engineers, and medics may use this channel to communicate outside of their squads.
Troopers without a specialisation may use Com-2 for fire team communications.
Com-3 is global communications, used for emergencies, or during communications snarl-ups. For this reason, Com-3 should always be set to November (129).