Employees of the Ministry of Defence and member of the armed forces have leaked secrets onto social notworking sites and Internet forums some 16 times in the past 18 months, a freedom of information request reveals.
Ten people have been disciplined over the matter and warned over twattering on the likes of Twitter.
In a sign of the times, the leaks were disclosed after a PR company made a Freedom of Information request to the MoD.
MoD staff aren't generally banned from joining on-line social networks in their personal lives or posting blogs and comments.
The department's code tells employees: 'Remember you are a member of HM Forces / MOD civil servant. Observe the same high standard of conduct and behaviour online as would be expected of you in your professional or personal life'."