Let's examine whether a case may be made. The National Security Agency is part of the Department of Defense and therefore of our nation's military. By law, the NSA director must be a commissioned military officer, and per its mission statement, the NSA gathers information for military purposes. That's strong evidence that NSA personnel would qualify as soldiers under the 3rd Amendment.It’s been said many times that the US Constitution guarantees no right to privacy, but a broad interpretation of the Third Amendment might actually include some expectation of privacy. Ars Technica lays out some of the pros and cons of this argument.
And why did the framers prohibit the government lodging soldiers in private homes? Besides a general distaste for standing armies, quartering was costly for homeowners; it was also an annoyance that completely extinguished a family's sense of privacy and made them feel violated. Sound familiar?