2 groups of lights rapidly moving north over Cheyenne WyFriday, April 1 2011 at. 21:10 while my wife and I were sitting outside we saw several points of light moving across the sky. There were two separate groups of 3 to 4 lights each moving parallel to each other directly north. One of the lights from the group on the left moved diagonally and met and continued to move with the right group. The time from when they caught our eye until they became to faint to see was only seconds. They were moving extremely fast, we initially saw them basically straight above us and then they disappeared to the north. We did not hear any noise associated with them, nothing obscured our view and the lights were not flashing or colored. In the area tonight the Air National Guard is flying at least 2 C1-30s, which is pretty common here. They were not around when we saw the lights.