Formations seen from Mt. Charleston, Nevada, at very south end of Nellis Air Force Base.We watched these lights, 6 white - 3 red ones create formations over an area 2 miles or more long. One broke away and came clear across the valley (several miles) to were we campefired - and hovered approx. 1-2 minues and went back to the 'others'. It was incredible bright, white - no distinct shape in this light. Typical non-terrestrial hover. >From our look out point, we had free vision northwards over Nellis AFB - no houses or other residential lights except due west a small village. The lights seemed to switch off and reappear elsewhere, creating new formations. We left at near 03.00. Came back 5 other occasions over the following 3-4 weeks, had sightings on three more of them. Always more than one ship - always more than one witness. One time we had one in front of us ascending Mt. Charelston. This one was red. It appeared and dissapeared a few times as we made our way up. Then later - an hour maybe, (23:45) - we saw it 'sitting' down below our vista point, on an area no roads are. In the middle of wilderness. This evening we also saw formations over the valley on the south side of Nellis Air Force base. 6 objects. Observation time this event was ongoing til we left at 03:00 and they were still there when we left. This is totally non restricted air space.