The use of a chase car explained here.
https://www.youtube.com/watch?v=YvmqmG30dHo
Why does the U-2 need chase cars? > Beale Air Force Base > Article Display
The latest car used at Beale AFB is the Chevrolet Camaro replacing the Pontiac G8 which is no longer produced.
http://st.motortrend.com/uploads/sit...uarters-02.jpg
When I first saw a U-2 at "an undisclosed overseas location", they used a Chevrolet El Camino - now a much prized collector car !
https://s-media-cache-ak0.pinimg.com...ffab412828.jpg