Line of about 20 white crafts moving in formation.

On 03 December 2021, at approximately 1850 MST, I exited my vehicle and began walking to my dorm room. I looked up towards the sky, as I routinely do to star gaze. Living on an air force base I sometimes watch the aircraft taking off or might stare at one thinking it to be a shooting star before I notice the mechanical flight pattern and blinking lights. Tonight however, I noticed an odd array of lights that didn’t appear to belong to any known aircraft. I originally thought there was light reflecting off a telephone wire because of how many dots of light there were and the rigid line formation it was in. As I investigated further, I realized there were no telephone wires within distance or at the altitude of the angle I was looking up at. The shape of the formation was a straight line with about twenty or so lights one behind the other. It moved slowly but covered a large amount of distance. As I watched, it moved slowly through the atmosphere without making any noise and eventually disappeared one light at a time as it crossed an imaginary point. I immediately called a friend who was three hours away and claimed to have witnessed the same phenomena around the same time.