My wife and i were setting up our telescope in the park on the night of the full moon (28jun2018) for moon-watching and stargazing/planet viewing purposes. before the telescope was fully set up a vertically aligned donut/ringed object with yellow-orange light/surface appeared below the moon traveling from se to nw at extremely high velocity and low altitude, roughly 500-1000ft agl. the object made absolutely no sound but at closest approach was within 1 mile of our vantage point/location. as a united states air force veteran and special operations intelligence analyst and previously holding a top-secret w/caveats clearance, i can say i witnessed a craft to which i have no explanation or knowledge of existing yet can't explain what my wife and i saw that night. it traveled approximately 50 miles across the sky at low altitude within 15 seconds and yet made no noise. i tried to capture the object on my phone that was in my pocket but was unable to do so in the 5 seconds it took me to grab my phone due to its extremely high velocity and short observation time.