Bright flash and blue ring of fire emitting vapor trail

I was a military police officer at Fort Story Virginia. At the time of this sighting, myself and my partner were putting delineators in the road for a bike race or marathon the next day, I can't remember which. Anyway, I was driving the truck, and he was in the back dropping the delineators on the road. We were moving very slowly.Suddenly there was a bright blue flash, like the world's biggest flash bulb. My partner yelled "Look!". At the same time I stopped the truck and got out. My partner was standing in the bed of the truck pointing at an object that I can only describe as a ring of blue fire, hollow in the middle, moving up very rapidly. It had a small vapor trail following it. Then it disappeared.