Viewing fireworks in Ashburn, VA night of July 5, 2014. Noticed two distinct UFOs hovering due south, apparently over Dulles Airport, to the right of fireworks display. First was two vertical lights, top red, bottom green. Second was single red-orange light, which appeared farther away. Can't be certain of heights, sizes, or distances because they appeared at night. Red-orange object was to right of red-green object. Both would hover, then descend and ascend from time to time. Red-green object would occasionally descend below tree line, then ascend to height again. Red-orange object never descended below tree line. Red-green object would move horizontally as well as vertically, in curved vertical paths, but red-orange object ascended, descended, and hovered only. Both objects moved independently of each other. Red-green object eventually descended below tree line, leaving only red-orange object, which remained hovering for about five more minutes, then moved off to south-east in curved path. Suspect red-green object was a drone, but not certain. Do not believe red-orange object was drone or aircraft, because it did not have standard red-green navigational lights.