Think "Red Dawn" (the original not that horrible remake). Or perhaps a modern civil war type battle (USAF Aggressors are great for that idea). There are many possibilities with the Nevada map, just use your imagination.
Also the need for civil traffic, they are a constant presence in today's battle space. The upcoming SoH map will be home to 2 of the largest airlines in the world. The airspace above the UAE is one of the most heavily traveled air corridors with flights traveling to and from Europe. In Nevada KLAS is home to several major airlines, the surrounding airports are home to literally thousands of small aircraft, not even counting the tour helicopters. Also the airspace of Georgia is a heavily traveled air corridor connecting to the same corridor that traverses Iraq and the UAE. Civilian aircraft are a very important obstacle and a welcome addition to the DCS universe.