Area 1 - Helicopter ride

There’s one thing to know here. Always use your gatling gun. Use it while the Swarm Missiles and Rockets reload and take out the enemies as you see them.

Area 2 - Inside the facility

You pretty much have to follow the same tactics as when you were on the helicopter. Follow Gideon and don’t stop. When you get to the ASTs use the pillars as cover to protect yourself from their attacks