There is a saying, the only way to understand a battlefield is by experiencing it. In this kind of situation no one knows who will get hit by the bullet first, it is advisable that everyone understands how first aid works because if you were also one of those soldiers that didn't take the lessons concerning first aid seriously you won't be able to save your friend. He is just lucky to have someone like you beside him.
You are very correct dear friend, everyone of us need to learn self aid because no one knows what the next situation would look like. We thank God for his protection thus far though🙌