Ambush

You must get a vehicle, and drive over to wear Sam is. Have the Assault Rifle ready, now as you get there, you'll be into action immediatley. There are a few EDF troops shooting at Sam, as she tries to hold them off with a Pistol. Kill them with your own Assault Rifle, after that, you have a time limit to get ready for the incoming EDF. Put a Remote Charge on the two fuel tanks near the first bridge nearest to you. As they come, save the third tank near the other bridge for any of them that go pass there. Place some fuel canisters on the bridge. If you upgraded the limit of Remote Charges able to be thrown(like up to 5 or 6), then place those on the ground where the trucks come in, or on either the ground, the third fuel tank, or the fuel canisters on the bridge. As soon as time's up, the first trucks come in under the bridge, while some personnel come over the bridge. Detonate the charges if it gets too hot, and then throw some charges at the trucks to blow them up. You should be done, now collect any salvage you can find, and head back to the Safehouse.