Opaque ball sighted under night vision system only

While conducting a military training flight under night vision goggles in a UH-60 at low altitude (50 ft AHO) and approx 140 kts , night was clear, no moon with unlimited viz. I saw under night vision goggles(NVG) only, 3 blinking lights at extreme alt.(30.000 ft+ and directly above my aircraft)seperated by 2 to 3 miles in a triangler formation. The blinking remained in unison for the duration of the flight(2+30)and in sight. Another object circuler in shape and moving up from a lower alt when sighted, with nvgs only, moving up and over my aircraft at extermely close range(-50 ft).Movement was from nose to tail of my aircraft. Object was circuler and opaque with what appeared to be flames or some sort of energy bleeding from the rear of the object trailing back about half the width of the object(like a ball that was on fire and it was thrown) ball width approx 20 ft. No other aircraft operating at that time in my area.No malf with my aircraft sytems before or after sighting.
Witness elects to remain totally anonymous.  PD