1. Start editor
2. Place Opfor Men Rifleman(AT) on the south end of the runway
3. Place any empty vechicle on the runway 300 m to the north of your rifleman(AT)
4. Try to hit the vechicle with 300m Mark.
5. Try to hit the vechicle with 500m mark.
You can also place vechicles 400, 500 or even more meters to the north of your character.