Birthname: Michael Murphy born 1973 Munich, Germany

I am searching for my half-brother. His original name is Michael Murphy. My Mom, Charlene Joy Murphy was in the US Army and stationed in Munich, Germany at the time of his birth. I do not know his date of birth, but the year would be either 1973 or 1974. My Mom died of cancer in 1997. I would very much like to connect with my half-brother... Thank You