Dugway expansion a mystery

[NVMojo]

Does the Army want to expand its Dugway Proving Ground in Utah so it can forcibly obtain nearby land it contaminated with chemical weapons but has refused to clean?
Or does it want to keep UFO-hunting groups farther away from the secretive base because they now closely watch it, suspecting that it stores and works on alien spacecraft as a "new Area 51"?
Pick either theory or one of your own because the Army isn't going to say. Five months after being asked, the Army has officially refused to release documents explaining why and where exactly it might expand Dugway.
In a letter denying a Freedom of Information Act request filed in October by the Deseret Morning News, Brig. Gen. James R. Myles, commander of the U.S. Army Test and Evaluation Command, states that the Army had identified "a number of documents ... regarding proposals to enlarge the boundaries of Dugway Proving Ground," confirming it is indeed looking at expanding the base that is already larger than Rhode Island.
But, he wrote, "we must withhold the documents in their entirety under Exemption 5 of the FOIA (Freedom of Information Act). All of the documents found responsive to your request are predecisional and deliberative in nature."

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http://deseretnews.com/dn/view/0%2C1249%2C600122609%2C00.html