LOL...learning how to use fighter aircraft. The Navy's Strike aircraft have (since WW II) needed the use of a facility that afforded a bombing range and other target facilities to teach tactics for the basic types of strike packages. Fallon (Van Voorhis Field) is now the epicenter of the Navy's Fighter and Strike Warfare instruction.
Lest we forget the rotary wing folks, Fallon is also the major training and tactics development area for vertical assault training.
The Base Re-alignment and Closure committee (BRAC) moved the TOPGUN school from NAS Miramar to NAS Fallon so that all fighter and strike aircraft (since it's one platform now...the FA-18) now have a one stop shop for tactics training. The VFC-13 Saints, the Navy's main agressor squadron operate out of Fallon in support of the air combat training mission.
There are 100's of square miles of Military Operating Areas (MOA) that ARTCC's Salt Lake City and Oakland have ceeded daily control to NAS Fallon for excercise areas to support the training missions.
Range targets are anything from huge bull's eyes graded into the desert to simulated airports and SAM setups. NAS Fallon has range complexes that are duplicated nowhere else.
Fallon's isolation has a couple of advantages. One, it means that minimally useable land is used for the training, keeping jets out of most folks' back yards. Two, it is a place for squadrons to get together, isolated from the rest of their air wing and home bases, to concentrate on getting better at what they do as a team.
Jim