Have you heard of Nellis AFB, Groom Lake Facility,DOE Nevada,Naval Air Station Fallon,Indian Springs,Tonopah AFB Naval Air Station Fallon? DOE Nevada formerly known as the Nevada Proving Ground, the site, established on January 11, 1951, for the testing of nuclear devices, is composed of approximately 1,350 square miles (3,500 km²) of desert and mountainous terrain.At Nellis AFB, according to the United States Census Bureau, the base has a total area of 3.1 sq mi (8.0 km2), all of it land.
[url]http://usmilitary.about.com/library/milinfo/statefacts/blnv.htm[/url]
All these areas are monitored by the bases I mentioned. Especially, DOE Nevada Test Site. You cannot go in there with out a pass.
Bu the way the government owns 85 percent of the land in Nevada. So even if something came down you would not know about it because you would be on Federal land.
http://www.allvoices.com/contributed-news/914109