Sighting of an arrowhead shaped craft about 100 feet over our heads with military escort.My son (a volunteer firefighter) and I (a youth minister) were sitting on my front steps smoking and talking before he had to go to work. We heard the distinct sound of a large military helicopter to the east of us and casually discussed the fact that it was strange that it was doing what looked to be training manuvers at 4:00 in the morning. We live over the flight path to the airport and see them many times a day. I was raised by a dad in the Air Force and was in myself so I am fascinated with aircraft and enjoy watching them when they do training excercises. We continued to watch as it came closer going from the east to the west and were also wondering why it was flying so low. As it approached the corner of our yard the tree was moving back and forth violently from the down draft of the rotors. That's when we noticed the street light reflecting off the bottom of a craft flying directly above the helicopter. It was shaped like an arrowhead and completely blocked out the stars for about 2 city blocks. The bottom of it looked like a snakes scales made of a metal we have never seen before. It had one red light at the front and was completely silent. Once out from under the light it was invisible again except for blocking out the stars and they just slowly continued west until out of sight. We then realized it was not 2 helicopters doing training it was the one helicopter moving to get below the craft.((NUFORC Note: Witness corrected date to July 23, 2012, during telephone conversation with NUFORC. PD))