This is wrong and rhymes with all the sabre-rattling towards news orgs from the white house over the last couple days.
It will also make the US armed forces _actively worse_ at their jobs. It won't even take very long. If you can't effectively reflect on your errors and consider non-politically-aligned points of view, your strategists are going to be running in the dark.
The strategists are hopefully not relying on voluntary journalism for their decision making