Any soldier or civilian injured after this was made public? What if one of them initiated a lawsuit? Or parents of troops who have been killed? I have absolutely no knowledge in this area at all. It still seems it would be hard to prove that the leaker or the media were directly responsible for death or injury. (Even though I think they are).
It doesn't necessarily have to be an injury, it can be increased exposure to the possibility of future injury (you can sue a company for releasing toxic chemicals into the environment giving an increased risk of cancer, EVEN if you don't currently have cancer).
But it is a lot more difficult to prove than a direct injury.
That doesn't mean it wouldn't be worth the publicity a suit against the NYSlimes would generate.