First, take out your shotgun before breaching the first room, shooting once should kill all 3 enemies.

Then you hear Sub Commander talking about some stuff, take your M4, click 3 to use the grenade launcher and aim between the fence and the wall, then when Commander stops talking you shoot the grenade launcher as shown in the picture below

Then either use the grenade launcher again or just kill the rest of the enemies with bullets.

Move up the stairs and kill all 4 enemies up close, don't move towards the next waypoint, stay around the stairs area and kill the next group of enemies that will spawn on the other side of the room. Once you've killed them, reload all your weapons (including the grenade launcher) and move slightly forward, stop when you see guys on ropes sliding down, kill them if you can, but when the heli spawns, stay where I am in the picture and shoot exactly where I shoot with the grenade launcher.

If you didn't hit the heli, retreat towards the stairs and try to shoot the heli down, then once you've destroyed the heli kill the rest of the enemies and move up towards the waypoint. Don't rush to the waypoint, because there's a group of 4/5 enemies that will spawn there when you get close, kill them, then move to the waypoint and kill the next 4/5 enemy group that will spawn near the stairs.

Next there will be a big group of enemies waiting for you, kill the enemies up close and then shoot enemies walking up and down the stairs, then just take cover behind the big red container and shoot the rest of the enemies. Once you've killed them all, don't go up the stairs, stay down and look for an SMG, a UMP with a Red Dot should be good, but a P90 with a holographic sight will also do.

Move up the stairs and when you get onto the small platform just before the last stairs, start running quickly towards the right 'breach' waypoint.

Before the smokes pop you have enough time to kill the 2/3 enemies near the 'breach' door, without reloading, breach the door, kill the enemies inside and that's Wetwork for you.


The last section is the hardest because it requires of you to be on time and be lucky, you can either use this strategy, or kill all the enemies with the thermal sight weapons, but I think it's better to risk it like that.

This mission is the hardest, you will have to run a lot, because sometimes you will be fighting 3 or more Juggernauts at the same time, but with this strategy it should be easier.

So once you spawn, go towards the left side of the map, there should be a Juggernaut waiting for you, use your grenade launcher to shoot him in the head, if you hit it at the right angle, you should kill him in just one hit. If you move forward, there should be another Juggernaut or maybe even 2, retreat to the spawn area and sit behind the car wreck, the one next to the resupply crate. By sitting there you can shoot at the oncoming Juggernauts, but they can't shoot you.



This mission isn't as easy as Wetwork, because you can't just learn the spawns and take it slow, you have to run around the map, resupply often and use a lot of flashes, and remember to shoot at the head as it is the only part you can shoot and maybe kill in one hit.

In the last section of this guide I'll leave a few links to Youtube videos you can learn from.
Just remember to use flashes, I was trapped a few times between 2 Juggernauts and I was able to survive by just throwing flashes at them.

Armor Piercing is kind of weird, it's both extremely hard and extremely easy.

So after spawning, take the Barrett instead of the M240 you spawn with, run up the stairs and just kill with the Barrett the 2 Juggernauts that spawn on the first 2 floors, then after reaching the top floor, there will be somewhere one Juggernaut, you have to kill him, then push to the 'breach' door from the Wetwork mission and keep going until you reach the heli pad.



Now you have to stay there and shoot at the Juggernauts that will be coming through the door you, yourself came through, sometimes there will be more than one Juggernaut coming, you have to kill one of them and then throw a flash at the other Juggernaut, reload and then shoot the one living again.
As I said, it's both very hard and very easy, it's hard because sometimes the Juggernaut will just ignore being flashed and will shoot you either way, but sometimes you can just do it in 3 minutes or less.

As I said with High Explosive, here's the links to videos that I learnt those strats from.