My Wife and I were at home walking up our driveway toward our house. Wife looked up over fence at sky and said look at that, I looked up to see an extremely large array of lights structured like no array I have ever seen on an aircraft. I spent 24+ years in the USAF in aircraft maintenance. At first I thought it must a group of helicopters in perfect formation, I also instantly determined it could not be choppers, choppers don't move anywhere near this fast and could not keep such perfect symmetry, this was no aircraft.IT Moved in complete silence, disappered behind trees and was gone when we ran around the other side. The object supporting the lights was huge and moved across the part of the horizon we could see at incredible speed,it appeared to blot out the sky/stars as it moved from west to east toward Mt Rainer.