As an NCO how do you deal with your soldiers that don't get along?

When I had this problem. I would take all the trouble makers out on a long range patrol. Away from the unit for quite awhile and basically train them to help each other with the tasks at hand for the mission. This was only used during training and not an actual mission. It didn’t work the first or the second time. But I had to break them down in order for them to gain each other's trust. We started working as a great team after that. Just like a family. We all have our own little quirks. Find it and use it as attainable tool. Each one survives as long as you got each other’s six ! I hope this helps....

Take a piece of paper and make them hold it. One holds with their left and the other with their right. Then give them a task like sweeping the floor or moving boxes. One person is the left hand, the other is the right. If they rip the paper they start over.
I used to make them hold hands, but usually one is a jerk and squeezes the others hand. The paper forces them to be gentle. The task makes them coordinate. Working together is usually so distasteful they don't fight any longer.

I have seen this is the past. I know a lot of my peers created a common enemy. I.E. the team or squad leader went out of there way to make them focus on them by making work harder don’t know if that is the way to go but it seemed to work for them .