Why? In recent months reporters and aviation buffs have stationed themselves on two hills on the land, which overlooks Nellis’s top-secret Groom Lake facility. From there. peering through long-range tenses, they can see the activities at Groom Lake, known inside the air force as Area 51. They say they’ve seen up to six Boeing 737 commuter jets a day flying workers in from Palmdale and Burbank, Calif, and from Las Vegas. And they report night flights of a craft that, judging from its lights, has extraordinary maneuverability.

Now Widnall has moved to shut down the Groom Lake bleachers. The hills are part of the 3,900-acre tract she’s asked Babbitt to close off. An air force spokeswoman confirmed Widnall’s request. At Interior, a spokeswoman said: “We gather the air force wants the land to create a visual barrier, a buffer to keep the public from looking into part of the Nellis Range the air force wants to keep secure.”

Aviation expert Bill Sweetman, who’s written a new book on the “Aurora” mystery, notes that the remote Groom Lake facility is so costly to operate that the air force generally uses other bases for its standard secret projects. “So what’s going on at Groom Lake that Widnall has been persuaded she must hide?” he asks.