You're gaining more experience with the game, and the missions are getting trickier.
Now you're on foot in the base. Go into the building to the right of the gate to move along once the base is clear. Note that you can't blow way into barred door, hmmmm. So much for geo-mod.
Throw a grenade in a manhole to go in. You'll find that shock grenades do well on the big robot at end, they freeze him for a moment.
Quill's on her way in once you kill the boss. Protect her in the courtyard. She goes into the control tower and opens the gate. The rest walk in. Now you need a diversion. The Ammo dump! Tangiers opens a gate for you. Go through and shoot any enemies there. Head to the door with a red light on top. Shoot more guys. You need to blow stockpiles on each floor. Go in - you'll meet a lot of resistance. "He'll guard the door".
Get around to all 3 and they blow up. Now run out.
Next, get in to the missile silo - blow up the wall near the fence to get in. Get into the battle armor. VERY cool. Walk your way through to the open street facing a fence. Now turn right and see official-looking seals over doors of buildings. You face another armor guy and blow him up.
Now you have to get out of the armor, ah well. Go along the streets. Go through the door by a jeep - go around the burning stuff and out other door. Go into the silo entrance and hit the lever. At first it doesn't work - gas comes in. Now it opens. A guy in there says "Is this about the burnt nachos?"
Your pal will watch your back as you go down the elevator. Now you're in the reactor area. "The elvator is the only way down." Wait for it and then run quickly ... Get in elevator and shoot anyone who opposes you.
You actually see your enemy on the right through the glass. Go in the door past the glass to get in the red area. You march him into the silo. Now push the big button in front of him and a rocket takes off, burning him to a crisp. Now you have to get out - you poof out in essence when the level ends.