Also called Tonopah Test Range, close to Area 51 (70 miles NE of Groom Lake).
This is where F117 was developed.

U.S. Route 491 (US 491) is a north–south U.S. Highway serving the Four Corners region of the United States. One of the newest designations in the U.S. Highway System, it was created in 2003 as a renumbering of U.S. Route 666 (US 666). With the 666 designation, this road was nicknamed the “Devil’s Highway” because of the belief by many Christians that 666 is the Number of the Beast. This Satanic connotation, combined with a high fatality rate along the New Mexico portion, convinced some people the highway was cursed.

“In Room 3102 in the underground warren, an electronic map of the United States indicated the locations of the military’s most secretive and lethal units, just in case they needed to deploy in a domestic emergency.”