F/A-18 Hornet flying very low over Saline Valley hot springs (Death Valley National Park).
US Air force uses this remote and rugged desert and mountain area as a training ground, presumably because they are similar to the terrain in Afganistan and Iraq.
Almost every day, F/A-18 Hornet fighter jets fly very low and very fast (close to the speed of sound) over Saline Valley.
For more information about the F/A 18, read en.wikipedia.org/wiki/McDonnell_Douglas_F/A-18_Hornet