Wet Works is easy. Just take your time. Always have one guy be support, and the other more of a point man. As far as the helicopter part goes, you have to walk towards that first rocket launcher to initiate the helicopter spawn. So, don't go near it until you have taken out all of the enemies. Then once that is done, run up there, grab it and take the Helo out stat-like. Also, always have one guy hang back and watch the top of the stairs you're about to go up. If there is too much resistance on the next level, the point man can fall back while the guy watching the stairs mows them down. Once you clear an area, they will not spawn behind you. So, on the smoke part, have one guy hang back to watch the stairs, while the other goes up and shoots for a minute. If the point man gets hurt, he can fall back or crawl. Just always have a fall back strategy on Wet Works.
For the 15 Juggo's, just have one guy grab the Barret, and the other the Intervention. You will have to "man" your way through the first couple usually. You will eventually come to a ammo box with a MG4 laying near by. Set up some claymores incase you have to retreat, and then pretend you're deer hunting. Just set at that ammo crate with the sniper rifles and you will beat it. Easy as pie. If you're brave enough, you can even have a point man that ventures out to bait them. As long as he doesn't go to far and has some claymores set up for retreating routes, than your golden.
Now, someone please tell me how to beat the Juggo's with explosives!!! I'll even take you through the other echo missions on 360 for sure. If my roommate is at school than I will even take you through them on PS3 if you have them unlocked already. I'll even show you how to beat any other mission on there. I can at least tell you which missions you need pure luck to beat, and how to be in the best position incase that luck shows up.
Come on!!! Don't be stingy!!!