It is an important feature of democracy that the government be held accountable for its actions, which would be facilitated by making government documents public.
That will never happen because it leaves a governing body open to attack by the masses. Even if it was made policy, there would still be off-the-books meetings.
There would need to be protection for the military (ie, location of troops). An amendment to the statement such as "except where it would directly endanger lives" would be useful