Alpha - The Pit Call of Duty: MW2 Guide

What matters in this mission is time, you don't choose a difficulty. You just have to complete the course while shooting every target showing an enemy to complete the mission and get one star. Shooting a target with a civilian automatically blocks the possibility of earning three stars.

Target localizations:

Green - civilians

Red - enemies

First three targets are static.

Two moving targets - a civilian and an enemy.

Four moving targets show up in different spots.

One moving target - an enemy.

You can only use the knife on this target, after running up the stairs.

Two moving targets, you can shoot two at the same time.

A big amount of targets, moving civilian and enemy.

Last two moving targets and sprint do the finish.