From GameWatcher: “Just Cause 4 is out now, and players are exploring their new world and blowing up as many Black Hand helicopters as possible. But the only way to advance the game is through squads, so how do you get Just Cause 4 Squads?
Squads are used to push the front line and unlock regions, but the game doesn’t make it very clear on the best ways to unlock these squads. We’re here to show you how to unlock squads in Just Cause 4!”
Source: N4G PC Just Cause 4 Squads – How to Get Squads and Unlock Regions