Hold on a moment!
NPR features the 50th anniversary of the U2 crash.
"Powers knew the full story couldn't be told during the Cold War."
Think about that.
The Soviets knew the full story, because they had Powers and they had the plane.
So who was being "protected" from the full story? Americans.
Secrecy has nothing to do with keeping info from the "enemy".
Secrecy keeps the truth from our own people.