I'm already a Navy veteran and Vietnam volunteer.

Our "incursion" into Cambodia began while I was serving as an officer at an intelligence facility.  The mere fact (not the operational details) of that "incursion" was Top Secret.  Why was it Top Secret?  The Cambodians knew.  The North Vietnamese knew.  The Viet Cong knew.  The Laotians knew.  The Chinese knew.  The Soviets knew.

Who didn't know?  Only the American people didn't know.

This lady's leak will probably do as much "harm" to America as letting the American people know about that Cambodian incursion would have.