After the helicopter section you will fall onto the moving truck, hijack the truck that you fell on. Whilst you are going through the next section you can shoot enemies from your window by clicking
, you can also get out of the vehicle and shoot the enemies from the roof. I recommend switching to single fire mode by pressing
so you can land precise shots.
When you get to the area with all of the mines, I recommend facing the camera downwards towards the road so you can easily see them. You can take a mine or two in this area, you can also restart checkpoint and it will still count.
Best to do this on Recruit difficulty,
If you are still having trouble, feel free to use this video as a reference.
Hope this helped, thanks again.