6 orange globes in the night sky over Rehoboth Beach.

While driving home in Rehoboth Beach, Delaware myself and my partner saw 5 orange lights floating in the sky forming a U shape. We pulled over and took pictures and video. All 5 aircraft were slowly moving in unison from East to West. They made no sounds and were completely silent. They looked like globes with orange lights that were slowly flickering, kind of like electric lanterns or candles with flicker bulbs.
 After a couple of minutes a 6th identical aircraft came out of the East (moving West) quickly towards the others. As it approached 3 of the aircraft forming the West side of the U went dark or disappeared. The 6th aircraft approached the remaining 2 and they formed a triangle.
 We continued to drive home but kept watching the lights in the sky. The remaining 2 aircraft disappeared and the 6th aircraft changed course and started moving East, flying quickly. When we got home a few minutes later I took another video of the 6th aircraft flying in a straight line East in the direction of the ocean which is 1 mile from where we live. The aircraft drifted up into the clouds and disappeared.
 Afterwards we heard a lot of helicopters flying around our house and area for approximately 2 hours.