I know what you mean Chief about wounds you didn't even know you had. On the occaion of my seventh month in the RVN war zone I was in a hot fire fight in which I felt something tug at my booney hat blowing it away. I didn't even pay attention to it at the time as I had my mind on dodging and finding cover. The fight, like so many of that type, ended quickly. While gathering up our dead and wounded to evac our team medic noted I had a blood flowing down the back of my scalp. Reaching up I realized that I had had an AK round skip off the top of my head barely breaking the skin. The medic quickly treated it and reported me as walking wounded capable of field duty. I was put in for my third Purple Heart but never received it as the after action report doesn't show me as having been wounded in action. The medic was KIA three days later so he wasn't able to verify. I didn't really care at the time. I managed to collect a third one anyway about a year later.