Late afternoon/early evening, series of 3 lights, equally spaced, descending, disappear/reappear Edwards AFB area.

While at Edwards AFB, while on 'line standby' duty waiting for the last aircraft to come back to the base, my fellow crash rescue fireman partner and I observed a series of lights descending from a somewhat high angle upper left to lower right. Thinking their was some type of aircraft activity or military flares off in the distance from another military installation, we contacted by radio the airbase control tower. They advised nothing was there. My partner and I looked at each other baffled, as we continued to watch this 'light show' for approx 5 to 10 mins out of our vantage point in the crash rig. It was as if these white lights were on an escalator, 3 at a time, same distance of seperation, but as one would disappear at the lower right another would reappear upper left.
 To this day I am baffled and have only said this to a few people. When the control tower said they had nothing on the radar screen, that was quite baffling.