We saw three bright white lights near Lucerne Valley in a triangular formation move very quickly to replace each other in its formation

As a result of the recent sightings and publicity regarding UFOs I thought I would submit a report regarding a sighting a friend (now deceased) and I had many years ago.  I can still remember quite vividly what we saw.  We were probably 15 years old at the time, approximately 1968, and wrote the sighting off as likely Air Force aircraft testing due to the location in which we say the display.  We were in Lucerne Valley, California, and were looking into the eastern evening sky.  We saw 3 distinct white lights, circular in shape, in a triangular arrangement.  The formation took up approximately ¼ of the eastern sky.  The three lights moved very quickly and replaced each other several times in their formation.  I have never seen anything move so quickly and in such a straight line.  The more I reflect on this I suspect this was not of our world.