The answer is yes.
As I pointed out, the Access to Information Act sets out 13 exemptions, including national security in all its glory. Those exemptions are interpreted differently and can apply to cabinet confidence or certain personal information.
When an ATI request involves national security, I expect all government employees, including those who work in access to information, to take a very careful and conservative approach, disclosing only what is possible, practical, relevant and legal to disclose.