The Utah Test and Training Range uses range equipment “valued at approximately $1B.” Also, “The annual operating budget is approximately $30.1M…” (as of 2012).
Known as UTTR, the land was first appropriated by U.S. Congress for military training in 1940, before Japan bombed Pearl Harbor at the end of 1941. 
So much land has been appropriated since then that it is the only ground based location within the U.S. “capable of supporting overland testing of cruise missiles.”
Official USAF video explainer of UTTR:
Despite the now perpetual-Congressionaly-undeclared War on Terror, the record number of bombing training missions at the UTTR was actually set back in 1994. Not only is it used by the USAF, but by the USA and USMC.
Some people say UTTR is part of the Area 51/52 conspiracy. NASA has used UTTR to recovery some space vehicles.
Recovery of NASA’s Genesis Return capsule in 2004.
ANCIENT NUCLEAR POWERED JET ENGINE FOUND IN IDAHO DESERT, PROOF OF ANCIENT ALIEN VISITORS?
U.S. FOOD CRISIS: USAF MAKES MONEY OFF CATTLE RANCHERS!
Me on top of the abandoned and forgotten X-21A, when I worked at the Edwards AFB bombing range in California, 1985.