Military and intelligence history mostly dealing with World War II.
As a veteran of several FOIA battles I understand your frustration. Your work over the years has been a significant service to intelligence historians. Thank you.
A system in a free country where 80 year old "secrets" are still protected is a joke. It really surprises me how documents from the 1940s are still redacted by some bureaucrats. Frustration is then the normal feeling for any dedicated historian.