Standing outside looking south west saw a large diameter white object with no sound, no trail, no streak.It was moving at Mach 5++ at a 15 degree down angle.My girlfriend then said oh look and then we saw a second on same spot, same characteristics.We saw two within 2 minutes from each other.They both went out of sight within 3 seconds.I am 57 years old and realized I have actually seen a UFO and not anything else.I know for sure these were alien craft and not man made.Too fast too silent unless black ops has stuff I don't know about. This is the first time in my life I have ever seen what I know for sure , no doubt is a UFO.