An RTO is responsible for configuring the communications of the element they’re part of. The best way to show what this is by showing an example. Let’s take a look at a battle group composed of infantry and some assets.

We can already see a clear command structure. Overlord is the high command (usually zeus/mission maker). Godfather is the command element within the combat group. They command three squads of infantry of which one is mechanized and works with a Bradley callsign Hammer. We can also see three M1A2s commanded by Sword 1-1 and two JTACs linked with Godfather that manage air support from two Blackhawks and two F-16s.

Every element is written down in this order: Callsign | SL, COC (chain of command) | Internal radio freq/asset.

This visualization of the command structure serves to ease communication. As you can see there are six different long range radio channels. Without a couple RTOs this unit is not battle ready.

This is one of many ways of creating what is sometimes called a tree. The most important rules are that it clearly shows the command structure, chain of command and communication channels.