Crescent / Boomerang Shaped object

I walked outside to try to view a thunderstorm that was to the north, just east of the Great Salt Lake. Told my mother who was standing outside with me that there was supposed to be a meteor shower soon. We watched the skies for roughly 3-4 minutes before she headed back inside. I looked up and in the dark, I could make out a craft of some type but could not determine what type of craft it was, as it had no lights on it and it moved silently. It seemed to weave into/behind the clouds, trailing/moving the clouds slightly as it moved through them and and I lost sight of it very quickly, it almost appeared to cloak itself as it moved south west.
This object was too large to be a bird based on the size of it near the clouds, it also moved in such a way that would not possible for a bird in the strong winds while ascending.
The best way to describe the shape is an amalgam of a crescent, a boomerang and a V in one shape. One single object with what appeared to be sections on the body which I imagine is where lights or some sort of multi-point propulsion system would go underneath.
This thing was exceptionally stealthy, I would not have noticed it had I not been looking in that area of the sky for a small window of time.
This may be unrelated but roughly 40 minutes later, I noticed a large/heavy helicopter that did not show up on flight radar flew low over my house in the direction the craft was heading. I'm familiar with medical transport helicopters, news helicopters and police helicopters, this was none of those.
I testify that I am of reasonably sound mind and was not under the influence of drugs or alcohol during this event.