Thats the Las Vegas Dispatch Center Primary Air to Air frequency. Check out the Great Basin Comm Plan, and there you'll see the State of nevada broken down into Dispatch areas http://home.att.net/~joking48/
The initial attack VHF air to ground frequency assignment has changed, I believe. I can't remember what it is now. This 2001 plan is getting out of date and not everything listed is current. I wish we were still at the point where the annual edition of these were still on the Internet. Made things quite simple.