Final Tier 4 Missions
While you can do this mission solo it's much easier with a parther. The first section of this mission has you as a gunner in a jeep, tubing enemy vehicles. Take them out as quickly as possible so they don't gun you down. As soon as you're out of the jeep take cover from enemies still behind you. The next segment is to push through a house, which is easy if you take care and take cover. Save your stun grenades. When you reach the area with the spotlight in your face and enemies with flashlights below, use your frags. Be careful when you drop down into the sewers, enemies are already watching you, but you can take cover across the hallway once you kill the guy there. Kill your way through and place the computer. For the middle section you have to defend the computer as it downloads. Enemy riot shield users will attack, so take them out with stun grenades and bullets. Retrieve the computer and get out of there. In the final hallway, an enemy juggernaut will attack. Throw everything you've got at it and don't be afraid to retreat. Finally, be wary of climbing the ladder, enemies will ambush you at the top. Kill them and exit the building.
Another mission to smash in, grab an objective and get out. The whole first area is just about killing enemies from a helicopter. Play it a few times to learn where they come out, and only reload your LMG when you have time. Usually you'll want to switch to your assault rifle after a bit. First off, take out the truck gunner and passenger, and driver if you can. Don't blow up the truck, it wastes time and ammo. Next up, kill the guys all the way across the way, and in the plaza below. Then there will be guys to the left on the ground by the columns. There will soon be more in the plaza, so use your grenade launcher if you want. When they say look to the right, it's the blue building rooftop. Once you've circled the building, more guys spawn across the way. Then a building in the middle will have guys on a roof trying to jump across and down. Once you drop to the ground, it's the usual mission. Stick to cover at the docks until no one is left shooting at you. Work your way to each drug stash in turn and watch out, once you blow one up more enemies spawn in all the places they were before. Once the last is down, take it slow and make your way to the exit.
Flood the Market
This mission is, again, basically the first mission of the campaign over again. Stick to cover and avoid the helicopter, you can't destroy it. Use your grenade launcher to take out groups of enemies. Once the chopper flies away, watch for dogs. Stick right and use the columns as cover. Take out the enemy jeeps with the XM-25. Once on the trading floor, stick to the outer wall so you don't get surrounded. Circle the long way to each code. Save the one in the middle for last. Once on the roof, run to start uploading the codes, then take cover and snipe enemies across the way. Stick to cover and use a rifle to take out the helicopter. When the second chopper comes to drop off troops, kill them as fast as possible and restart the upload if necessary. Once they are dead, a few more will spawn on the rooftops. Just snipe the ones that show up.
Co-op mode only. One player sits and gives cover fire from an AC-130, while the other proceeds on foot. This one is very similar to missions in Modern Warfare 2. The kicker for this one is a time limit. The AC-130 should do most of the killing, and the player on the ground needs to move as fast as possible. Unfortunately, moving from the starting position before the AC-130 has cleared out enemies is a death sentence. The AC-130 gunner needs to be as fast and accurate as possible. The ground player needs to sprint in, plant some C4 and breach a door, move up, and hack a computer in 90 seconds. Then you get an extra minute to unlock the main entrance, which should only take half that time if the AC-130 has been working. Once the main entrance is unlocked, the ground player needs to move forward enough to open it, then instantly take cover. The AC-130 player needs to clear out the dozens of enemies so the foot player can rush to the exit. That's it! Once there, the final mission is over.