Fast moving high altitude light makes impossible u turn

Approximately 45 minutes after sunset I was sitting in my front yard enjoying a cup of coffee and a pleasantly cool June evening. I was sitting under a large Indian Laurel tree that gave a clear view of a sizeable amount of sky between branches. It was a cloudless and clear night. The crescent moon and Venus were brightly lit to the west (my right). I was facing south looking up at the sky about 80 degrees above the horizon. I live approximately 12 miles from the Mexican border and this object was most likely operating in Mexican airspace. I often do this looking for satellites or space debris and occasionally the Space Station (I have an iPhone app I frequently use that identifies the debris being observed but I did not have my phone with me this time). While looking at the sky (there were two small stars visible) I observed what appeared to be a fast moving satellite moving west to east. It was just a point of light, about the same size as the star that was visible. It was at a very high altitude and moving very, very fast. I observed it for a few seconds with the intent to watch it until it went out of sight when it suddenly made an incredible u turn, reversing course in literally a second and returning in the direction it came from. I lost sight of it about 5 seconds later as it went behind tree foliage. No aircraft I know of could make a u turn at that speed and survive!
My Background: I am a 68 year old retired Supervisory Special Agent with the Dept of Homeland Security. I am also a former Police Officer and a 9 year veteran of the US Coast Guard where I served as a Search & Rescue Aircrewman in both Fixed and Rotary Wing aircraft. For 7 years while serving as a Special Agent I conducted investigations of drug smuggling involving private aircraft. I am very familiar with various types of aircraft and their performance. This isn't a very exciting report but one never knows if reporting it supports other sightings. I do have a fairly strong, but skeptical, interest in UFO related information. The recent 'disclosures' by the government leave me wondering what the 'end game' is what such disclosure is benefitting. I do know what I saw, according to modern physics, should not have been possible.