http://www.lazygranch.com/images/a51pan/october2003/groomnight1.jpg
This photo captures something moving along the ground.

http://www.lazygranch.com/images/a51pan/october2003/groomnight2.jpg
This photo captures something flying low above Groom Lake. 

Note in both cases you are looking for a light trail, not the object
itself.

I think the lights in the foreground are lens flare since there
shouldn't be anything on that side of the jumbled hills.