And with each passing day, it is clear that our addiction to fossil fuels is one of the most serious threats to our national security in the 21st century. (calcars.org)
It is easy to obtain, but it may have potential threats to national security in the future. (science.sciencemag.org)
This term may sound like some sort of threat to national security but it's actually a fairly standard defence against disclosure. (politics.co.uk)