I am very sympathetic to wartime necessitates but I would ask why fight to remain free if not to enjoy the freedom, including filming the government from a legal vantage, in times of peace?
With the proliferation of commercial LEO imaging satellites there's pretty much always one above you.
Synthetic aperture radar satellites work at night and under the clouds as well so if you're trying to hide an aircraft development program it's going to be rather difficult.
edit: Radar messes with SAR as well but the government hasn't even bothered to try to shield Area 51.
