Silent, erratic, ultra-fast tour over Missoula area of 3-5 copper-colored craft.Completely silent and faster than anything I've seen fly-- circling the city from northeast to west clockwise, out of sight within a minute or so. Near sunset, so the reflection seemed a copper color; at first they were spread apart but then grouped tightly in a formation. I thought it was birds at first but way too fast. Most profound was how totally quiet it was.