point of erm pedantry from across the pond
NSA is the listening post, sitting up there in the Maryland suburbs, taking it all in. It doesn't do active intelligence/espionage in the field with agents, or "spooks" as you so quaintly call them. That word, btw, has racist connotations and hasn't been in use in a long time. Just call them spies, but only when they work for the CIA.