To add to jwoody's suggestions
1: Spoiler: A few things you may not know. There's a transmitter behind you. There's no reason not to just hold down the fire button and hose, as there's no ammo limit and you can hit the planes pretty far away. Just keep the gun up so you don't hit Zero. When you get down to half signal, if the transmitter behind you is still up, focus only on it. It's separate from the rest and so easier to defend.
2:Spoiler: I'm not sure about the tunnels you went through. You have to go up on the tarmac once you're past the dead guards at the main gate, which could be interpreted as a tunnel. Once you work out what's wrong there, I'll suggest you NOT shoot the van the guy is in, but just let it drive a short distance away, where it stops and the guys get out to be easily shot without risking blowing up the van.
3:Spoiler: Good luck, is all I can offer.
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