Saw a blue orb flying slowly across sky.

I was in my backyard checking whatever turned to look into the night sky and see a light blue what I thought was a comet falling from the sky. It started turning and dimmed down to an orb. I believed it was a aircraft possibly but others flew past it with its lights on and this didn't have any besides glowing one color.
I was a watch stander in the Navy and seen enough night time flights to know a plane and heli.