SLB was going along the right tracks, but dook has got to the location first. It is
Wendover AFB in Utah.
Here are some more images I had lined up - the first two I think would have led you to it much sooner.
Republic-Ford JB-2 - the previous image was a crashed one. The launch site for these is still visible to the south of the airfield.
This image is from September 1945
On the bombing range
And these two were going to be the next images
From the 1970s