The range clearly extends from the west, opening to the east-south-east. You see a series of lines running perpendicular to the direction of the artillery range and if you zoom in on the line furthest to the east yet still obviously a part of the range, you see a large circular something which looks rather like a bullseye. Just to the west of that, you see a five hundred foot wide Star of David.
What's a Star of David doing on a satellite photo of an army artillery range? I'm hardly a photographic expert, but looking closely at the Star suggests ragged vegetation on it, as if someone had deliberately driven vehicles across it to make the outline (as opposed to this being some weird image artifact).
Update: the first star was initially referenced at theregister.co.uk. I dug around a bit to find it myself so I could let you look at it rather than just relying on the story. Then I stumbled across something else. Here's another Star of David, this one being a little over 300 meters across. Here's an artillery range in Fort Carson near Colorado springs.
Here's the image where you can see them together. The Star of David is faintly visible near the top and the artillery range is quite visible near the bottom (go ~ 1900 feet west of the range and about a mile north). What the hell is going on?
Update 2: Found a link which discusses this issue and claims that those are simulated SAM (surface to air missile) sites.