I Seek to Find a Half Brother in Germany Somewhere.

I am in search of a brother that I may have. My name is Jeremy Lee Mikel. My fahter, Henry Lee Mikel was in the service for many years and left the service around 1976 or 1977. Before he married my mother, he was stationed somewhere in West Germany. He was there for maybe up to a year. He was seeing a woman at that time over there, her nickname is all I know, it is 'Guitar', that is all I have ever been told about the woman. Together they had a baby out of wedlock, a baby boy. I don't know of what his name is or have ever seen any pictures, all I know is that the baby was a boy. The boy will be older than me and my other two brothers. If anyone has any information, this would be a big help to me. I would like to know who my half brother is and what has come of him and his mother....Thank You...