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Mission 12: One Shot, One Kill
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Jump on the sniper rifle and press up to get in close on the action. Wait 
until the moment that flag goes limp, and Mac will tell you to take the shot
too. Do so and you get only one chance, so make it count. Then press back to
zoom out and then hit the helicopter pilot. 

*NOTE: You can shoot at any time. You can start firing once Zakhaev is in view
and then just start firing randomly, taking the wind into account. You get 
about five good shots if you miss the first time.*

Now you will get off the gun and start running. Run a bit and get on the rope
to get down. Run forward and then you hit lots of enemies. Just toss some 
grenades to the right and then try to run to the right side and past everyone.
Wait for him if he's behind and then follow him into the building (don't worry
about the bad guys, for some reason they don't follow).

Follow him forward and kill a dog when one scares you. When he stops as guys
appear, get out a claymore and go right to plant it somewhere along the door,
and of course back off. Then get out your other rifle and start fighting with
the few enemies, or snipe them. When a chopper appears, just aim for the front
of it. He will help and the thing will crash land, on top of MacMillan of
course. Go around and pick him up.

Now head southwest and then set Mac by the building on the right, in the path
in front of the car; you want him to see both east and west, front and back. 
Three enemies will come from your front, and then two from the back. After you
hear the all clear, pick him up and proceed. 

Go left instead of right toward the fire. Set him down on a ledge that will
let him see over the obstructions in the field. Some guys will appear and they
will toss grenades, so just back away. When he says clear, pick him up and 
move forward. Then haul butt directly south and into a building before the 
heli tears you up.

Get to the end and get inside the room. Enter the red, burning room and go
through. Head south when you're back to normal rooms and follow the path. When
you see a dog, set Mac down in front of a doorway, or so that see can see 
through a doorway, and then check these four rooms for two bad guys. Pick him
up and keep going south. 

On the streets, keep going south and enter the building he points out. Take the
path on the right, through a shower area and then you'll emerge near an empty
pool with dogs inside. Go around to the break in the wall and jump down. 
Immediately set him down and shoot the two soldiers nearby. Now get to the
ferris wheel.

What comes next is a good old fashion standoff. Set him down in the yellow 
circle to the side of the ferris wheel. He gives you his claymores and your
job is to set these up in good places. One idea is to set them up behind the
cars so that enemies seeking cover will die. Another choice would be to set
all of them along a line so that you know some will at least be used. Either
way, set them up near the grass, and don't set too many close to the wheel.
Then you need to pick a sniping point. I would think either near his spot, or
perhaps on the ferris wheel. But I seriously recommend a place near him.

*NOTE: A cheap trick is to find a booth to the northeast of MacMillan's spot.
What you can do here is fight off the enemies as usual, using the booth itself
as cover. You can go prone in the corner adjacent to the doorway and under the
table. This spot will keep you from any grenade damage, and you can guard the
doorway, but no one should bother you. The only trouble is running to Mac 
when it's time.*

The first wave is easy enough, all of the bad guys come from the pool area. 
Try to get two in a row, and try to get them before they hit your bombs. If
you start seeing too many go for the sides, always be ready to whip out the
other rifle and start blasting away. If you take a lot of damage, run behind
the ridge and go prone, or get to cover if you're somewhere else.

*NOTE: To the southeast is a doorway that is usually shut. An intel is behind
this door, so fight your way to the northeast corner by the pool and fence to
choke off that enemy spawn point. Then you can go back to find the door is
now open to let more guys through. The intel is on the ground. 

This is an advanced tip here, but staying at either the northeast or in this 
doorway will be excellent places to wait out the assault. Much easier than the
booth or any other location. Trust me.*

But that was too easy. Now helis will come in with lots of guys, and more will
keep coming from the pool area. There's little solid strategy to this part, you
just have to survive. Honestly, don't worry about getting too many kills, he 
will do a lot of shooting. All you should do is start chucking all your grenade
types as your mines get used up. Then become more mobile and protect your 
flanks with your rifle, because they will get to your sides. Toss back grenades
if you can, but just back off if you must. Mix between sniping and shooting 
as well, mainly because so many will get close. Just survive, that's the best
advice.

After what seems like forever, the bird lands in the parking lot. Run to Mac,
pick him up, and hoof it to the back of the chopper. Run inside and you're
done.