Find a secret package left on the North Pole and take it to the right place. There's a mini map and the hint arrow to guide you. Watch out for police cars which will bump into you to prevent accomplishing your mission.
Your chopper crash-landed at an urban war zone. Use your machine gun to get through the hostile enemy soldiers while moving closer to the extraction point.
Protagonist was thrown into a prison because he's been accused of a robbery. The warden here is very mean and an intimidating guy. Help the protagonist rescue inmates then escape this prison of hell.
You've been causing too much trouble behind enemy lines. They're going to take you out the only way they know how. RunNGun as many as you can before destiny catches up with you.