The base, a growing, massive 3 story building, has many things. Such as AA cannons. How did they get it? Cash. Drugs. A lot of money, a lot of fire power.
No one expected this much resistance.
Apaches get shot down by rockets. The firepower is overpowering. They also have snipers, with the most recent sniper rifles.
The soldiers get shot down left and right, as well as the Apaches. And the members in the checkpoint are still fighting.
In the checkpoint, one rocket fires, and shoots down another Apache. They got used to aiming and is now ready for anything thrown at them. After the retreat, they cheer, and go back to base, only to be found being raided. The members smile.