Okay, I want to make this easy as possible. Okay On level 3, it very easy. Chance will distract the guards while Gabe Logan can get inside the tunnel.
To get armed with equipment but before this there are two lights on and stand in the middle of the two lights so that the bad guys don't see you.
Then once they passed go get your equipment and go back to Chance and make the bad guys target you so that Chance doesn't get killed. Then once you have done that continue your mission.
There will be bad guys coming towards in all Flak Jackets and Gabe gets a "Fire House " and you aim it towards them and it will kill them.
Get the one behind you. Chance will say "Gabe Behind You". Then to cross from one end of the tunnel to another, you got to use your knife because if you do not there will be a ambush with snipers and they target "Head Shot".
So use your knife and once you get behind them, stab him.
And once you made it to the tunnel, there will be army things in the middle of the road-ways and so when Chance gives himself up pretending to be Gabe.
You have to find grenades and while they have Chance hostage, you need to go to the back of the truck while they have Chance hostage. And if you do not, it will kill you.
So once you got the grenades go to the power room, (at the beginning at the second tunnel) go blow it up with the grenades.
And Gabe will wear his nightvision goggles and you shoot the bad guys and you continue the mission towards the way that they had Chance hostage and you continue going until mission complete.
Added by: Anthony , ID#7533