As we know from wildlands, the unidad was also feared because of their alert System. They keep chasin US till we retreat. But in Breakpoint the sentinels have only a specific unit that calls reinforcements. And the azrael drone, that most time can be avoided really easy.

So my Suggestion. Is as follows

Commanders and Leaders can call reinforcements Like sentinels to help them in Any time if we Dont take them down before...

The specific (lets say "caller") units can call wolve units and sentinels units. This can be mixed up.

If wolves detect us and we let them make a Radio call, they call another wolve reinforcements and we Start an alert System as we know it from the UNIDAD in wildlands!

Alternative SUGGESTION!

on the roads there are never units that can call reinforcements. If These Suggestions above are too much for you then i have the Alternative way:

Integrate the reinforcements caller units to the random enemy spawns Pool on the roads and Roaming patrols. Its Not good to See them only in bases. They should ALSO roam the roads and Mountains and so on!