Triangle formation sighting in Tacoma, WAMy two friends and I heard what sounded like a rocket going into the air. We went to the higher deck in our apartment complex and looked up into the sky. Right then we saw a really fast and quiet object flying through the sky. It had four beams coming off each light, two sets of three lights in a triangle formation. We went to find where the sound was coming from to see if they were related and discovered it was blowoff from Simpson Craft Mill. We all three are just flabbergasted about the incident and had to report it somewhere.