no, they r not allowed to tell anyone be it their parents, children, wife or friend.
My father is in MI and he has told me this and he know much more than us.
i dont believe the pics that are posted here which are without masks actually are marcos..!
What the hell..! have u ever heard about 6th pay commision? plus defence personals get many many many facilities like free water, 24 hours free electricity, free cereals, canteen etc. etc. etc.