Originally established as a temporary training site or World War Two bombing practice, the Nellis Range has become the largest classified swath of land in the world.

Encompassing 3.1 million acres, combined with more than 12,000 square miles of airspace, Nellis envelops the Tonopah Test Range, Groom Lake, and a host of other facilities. The Nevada Test Site is contiguous with Nellis, having been carved out of Nellis by the DoE in 1951.

Several times a year, Nellis hosts the "Red Flag" and "Green Flag" exercises, where pilots from around the world come to train in a simulated battle-space above the range.

The CENTER FOR LAND USE INTERPRETATION has an excellent CD-ROM about the Nellis Range.