Yep a couple of times, 3 actually and all while I was in the Air Force. My first duty station was Ft. Hood and I was at a Wal-Mart in Killeen or Copperas Cove and ran into a guy I played HS football with. He had joined the Army and was stationed there and about to ETS out. Third time I was PCSing out of Keesler AFB and ran into my old elementary buddy while outprocessing the legal office. Last time was just here in AK, another guy I played HS worked as civilian on base here and I had to work with him to write a new job description for our civilian hires.