Two screws in my Eisenhower Jacket

Recently thrifted a sick Eisenhower jacket, love the fit and everything. One day I was at a restaurant and I noticed a bump on my elbow, so I moved my arm and cleared the table. I put my arm back down, and I still felt the bump, then I felt the bump and it's a screw/nail. I have one in both arms sewed into the jacket. Anyone know why or have any information lol?