In the level 'No One Gets Left Behind', you'll reach a point where you regroup with your 
team on top of a hill. Then you'll have to pass through an enemy compound. It'll be easier 
for you if you kill all the enemies in the first compound(only).Then look to your minimap 
you'll be marked as green colour and your teamates as blue which makes it easier for you 
to find what lies there.Follow the trail that leads to the blue dot.There will be a dead 
looking soldier hanging on the cement wall,but he's not dead,go near him and release him. 
There will be two more soldiers marked on the minimap, on the entrance of the other compound, 
but this time don't kill the enemies just quickly run to them and release them.
They will help you kill all the enemies.Note that once the area is cleared they will no 
longer follow you. Try this out.