I saw four or five "projectiles" launch minutes apart, straight up in the sky, change trajectory, and shoot north.I saw four or five "projectiles" launch minutes apart, straight up in the sky, change trajectory, and shoot north until they were gone. From where I am in Sea-Tac, it look liked they were being launched from somewhere in Pierce County.They left "trails" that took a great amount of time to disapate, where as the aircraft flying overhead had trails that disappeared quickly or within a few minutes. Whatever I saw launched did not look like aircraft. They looked like missles. What's going on??((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))