Due to licensing issues and the fact that we want to be sure its not misused to shoot at airliners and the like, for now the working SAM is only available to to the admins. The version you can download is so that you can see the SAM in events and such.
"No one dared to make a slip, the stranger there among them had the big iron on his hip."
If you'd like to be able to see SAMs, as well as boats and depots, that we use during the events, it should remain installed. It would be hard to tell when it was destroyed without being able to see it. Up to you, however.