UFO Sighting in Littleton, Colorado on April 3rd 2016 – UFOs traveled from east to west following each other on the same path

My son and friend were golfing and observed UFOs for approx 2 hours they were rectangular objects with a dark center and were traveling east to west on and off for 2 hours plus they were following each other along a similar flight path moving slowly, slower than a airplane would move. After about two hours my son called me at home and I met him in a field south of the golf course, about 1/4 mile west of the foothills. As I was approaching the meeting I heard military jets flying in the area. after that the sighting wound down and we photographed one of the objects.