If you have seen my guide on how to get all stars on Call of Duty: Modern Warfare 2 http://steamproxy.net/sharedfiles/filedetails/?id=154266479 you'll know how these things work, if not then here's what you need to know: We're playing this on VETERAN, this means 3 STARS.

STAY SHARP is the training mission, it's very easy, especially with a partner. If I get comments asking for more information I'll make a video for it.

MILEHIGH JACK is a close quarters mission, use of shotguns are advised, the problem is...you don't have a shotgun, what do you do? Well, after breaching the room some hostiles will enter the room, kill them, one of them should have the shotgun you require. By throwing flashbangs into every room before entering and rushing with the shotgun you'll get to the final (breaching) room in no time! Just breach the room and shoot whoever needs to be shot, but be careful, after breaching the room a few hostiles will enter that room, once you get rid of them the mission will be completed.

OVER REACTOR is a video.

HIT AND RUN is the last mission of Tier 1, you start with a sniper rifle and a mp5 in this mission.
The perfect strategy for this mission is sniping, but there are many parts in the mission where you'll need it the most. Once you take out the first guy everyone else will notice you and will start attacking your position, along with them come TWO little birds, you have a lot of cover as long as you stay in your starting position but the question is, HOW will you dispose of them? You can snipe them down with two full magazines, you could pick up the light machine gun or you can use the stinger, it's up to you. After they are down you should look down, you'll notice a lot of hostiles shooting you from a lot of places, sniping them down is the most logical thing to do, but you could also throw a couple of flashbangs and rush into the objectives. Once you've gotten both objectives you'll have to get to the hostages, same goes here. You can either snipe them or rush them, the only thing that matters is that you get there safely (not dead). Once you get to the hostages you'll have to throw a marker, after the countdown for the evacuation goes off you'll notice the huge gates opening and LOADS of enemies coming in, sniping them is the smartest thing to do, but have a close quarter weapon prepared at all times, once the helicopter (evacuation) arrives most of the hostiles will flee, and once you get close to the helicopter the mission will be completed!

TOXIC PARADISE. After landing you'll notice some gear in front of you, I'd suggest keeping your current weapons (Light-Machine gun & Thumper), right after you walk into the street and get shot the first time you'll notice you take less damage, this is because you have a juggernaut suit on. Proceed to kill everyone with your machine gun and take the first two samples, remember to throw the markers in crowded areas in order to preserve ammo until the ammo depot. A lot of people will come down the stairs from the street you're supposed to go into, take some cover and use your thumper on them, after they're cleared out you should head up those stairs, there you'll see a vechicle waiting for you, take it out with a thumper or use the airstrike marker, it's up to you. After the vechicle is dealt with you'll notice the ammo depot, now your machine gun has +600 bullets and your thumper +20 shells. Proceed up the ladder and throw a flashbang into the crowded room that leads to the next area full of samples. Once you're out in the open you should use your airstrike marker + thumper as much as possible, get the two samples and rush inside. You should be on your way to the next ammo depot, but once you get out into the alley behind the ammo depot you'll notice someone who looks a lot like you...yes, it's a fellow juggernaut! We all know how to take those out! Just throw a flashbang and spray him with your machine gun, take more ammo just in case and proceed into the next area, from here on you should basically just rush. Take all of the samples and run over to the rooftop where your extraction will be waiting, you'll have A LOT of hostiles in your way but most of them should be easy to evade or obliterate.

FIREWALL is a CO-OP MISSION. Let the turret (your partner) do all the work, you just have to proceed to all the laptops and press (and hold) F so the turrets will link up to the next area. Be careful because once you go up the stairs to the next laptop some hostiles will come from behind, tell the turret gunner to take care of them but remember to take care of yourself as well because there are some hostiles by the laptop as well as some hostiles coming at your position. Once you get that laptop the windows will open, allowing you to enter the 2nd out of 3 areas, 2 littlebirds carrying personel and 1 attack chopper will immediately start the assault. The turret is good vs. littlebirds so it shouldn't be that hard as long as you can take care of some ground forces, now you should rush to the next (and last) laptop which will unlock the gates to the 3rd (and final) area, let the turret gunner take care of most of the incoming hostiles, remember to take cover, one of the pipes will be recommended because they can cover you from the attack chopper as well as some ground hostiles, once the first wave is done you should run over to the exit THEN IMMEDIATELY run back because a large group of hostiles will spawn, once the turret gunner takes care of them it will be safe to run to the final green smoke.

FATAL EXTRACTION is not easy, you have to concentrate on multiple things at once. Hyenas, Sentry Turrets and A LOT of hostile ground forces will be around the whole area, once you kill a hostile there is a chance of it dropping the much needed intel, once you collect all the intel in the first area, the second area is unlocked which will lead you to the warehouse where the last 2 are located, along the way there will be a lot more hyenas and sentry turrets than you think, be very careful and take your time during the period of this whole mission.

HOSTAGE TAKER is a stealth mission, so please watch the video to see how it works.

Tier 3 starts up with the training mission called:

CHARGES SET, I don't have to explain this one either because it's like the first one with a twist.

RESISTANCE MOVEMENT will be easier to explain with a video.

LITTLE BROS is better played with a partner. At the beginning you have to wait for help to arrive, the choppers should be there in 30 seconds, until then you'll have to hold out, once it's there you should fight your way to the chopper (With 2 players, the other played will take out most hostiles from the chopper). Once you land on the roof you should fight your way down the offices and go to the objective, be sure the room is clear before you arm the bomb, once it's armed you'll get a one 1 minute timer to get to the extraction point, get on the chopper and enjoy the cinematic explosion.

INVISIBLE THREAT would also be recommended with a partner, the partner will be a sniper located on a roof, defending you (the juggernaut who has to defuse the IEDs) and also having access to the predator missle, anyway...Let's get down to it on singleplayer mode. As you start with your thumper and light-machine gun you will have to use the predator missle in order to locate the IEDs.
There are 8 IEDs located around the whole area, once there are 3 left a tank will approach the area, you can take it out with the predator, once there is 1 IED left a littlebird attack chopper will assault your position, once you defused all of them the mission is completed.

SERVER CRASH stars off with a vechicle section, as you shoot everything in your way with your thumper and SCAR. Be careful not to miss any vechicles because they are incredibly dangerous (on veteran) once they get a hold of you. Once you're done with the vechicle section you will enter the catacombs, once you're down there you should head to the hideout and activate the DSM. This will activate waves of hostiles coming in, you have to hold your position until the download is completed, be very careful or else you'll have to go back to the start of the mission! Once the download is completed take the DSM and head back up, to the vechicle, But guess who you'll meet on your way...it's your favorite...MR. JUGGERNAUT!!! He's here to pay you a visit! Once the juggernaut is dealt with you can proceed to the vechicle. Once you get on the vechicle the mission will be completed so congratulations!

SMACK TOWN is not as hard as it is annoying. You start off with an air to ground section from a helicopter, you get shot at from a lot of positions but don't get time to shoot them, I suggest using the grenade launcher on your M4A1. After they're dealt with the helicopter will send your attention to the rooftops by your right, take everyone out with your light-machine gun or M4A1 grenade launcher. Once that incredibly dull and long helicopter section is over you will get some orders to destroy some narcotics, the narcotics are located in the two marked buildings. Let's go to the building on the left shall we? The best way to get up there will be through the stranded boat and into the balcony. After you went up the stairs, thoroughly cleared out every room and destroyed the stash it is time to go to the other building, just clear out the ground floor and run into the next building NOT the objective building. Go up the stairs and then climb the ladder, you should notice a convenient ledge to jump off, do it. Jump over to the next building, from here on you can jump over to the objective building. Once you're on the balcony you should climb the ladder because the stash is located on the rooftop. After the second stash is destroyed you will get the order to go back to the chopper for extraction, once you're there the mission is completed and once again you prevailed.

FLOOD THE MARKET. Watch the video because I am tired of typing.

FIRE MISSION is the final mission of the Call of Duty: Modern Warfare 3 Special ops, DLC not included*. Let's start, as the AC-130 (your partner) takes out everything in the way you should simply rush to the objective since it's a timed objective, just go to all objectives and makes sure you and your partner have a stable connection in order to send each other messages such as: "Need some help!" or "It's clear, you can proceed". As the player be sure to take a lot of cover but also make a lot of progress because sitting in the same place isn't going to get you anywhere...But as the gates open and the final assault begins you should hide until it blows over and rush into the end and thereby completing the mission.