I used to work for the US Navy,worked as a contractor for Raytheon.At a Relocatable Over the Horizon Radar System sight. On my way,for a 12 hour shift,0600 to 1800.Saw a shadow flying from SE going NW.Cloudless sky.It was black,I guess, no lights,no color that I tell. But it did have a delta, maybe boomerang shape, no sound either.It really stood out against the night sky.It kinda gave me a feeling of euphoria and light headedness.Though,I did not notice at the time,I apperently should have stopped and taken detailed notes.It was about 0440hr.I traveled this route,seven days a week,every two weeks, I worked one week on, one week off. It emitted no sound,no lights,it did have a particular shape.Pretty strange..Well, about 35 to 50 seconds after it flew over,there two UH-60's. that were flying, chasing after it.I noticed that they had some markings, were flying with absolutely no navigational lighting.Inside the cockpits they were probably using NVG equipment. They were definetly military.One of them did slow down for a couple seconds,to do a visual on me and my car.