The US has vast holdings in the form of bombing ranges, missile test ranges, federal lands appropriate for nuclear weapons testing, etc.

A few to consider:

Naval Air Facility El Centro

Yakima Training Center, WA

National Training Center, Fort Irwin

Marine Corps Air Ground Combat Center, 29 Palms 

China Lake, Naval Air Warfare Center Weapons Division 

Barry Goldwater Range Complex

White Sands Missile Range

NEVADA TEST AND TRAINING RANGE

UTAH TEST & TRAINING RANGE