This cover was censored at the Supreme Headquarters Allied Expeditionary Force (SHAEF) on January 8, 1945, at the time probably in Paris (?), and mailed to the newspaper Evening Star in Washington DC.
A machine receipt postmark dated January 12, 1945 suggests air transport, although an air mail designation is missing. The 3c franking is mysterious. The cancellation is not legible. No sender is named. Apparently, the envelope contained war reports or photographs etc. for publication. WWII mail matter that underwent civil or military postal censorship is very common. Virtually all soldier's mail, and a lot of the civil international mail was censored. This type of censorship, press censorship by the Field Press Censor, is certainly not that common, but I have no comparison.
Any additional insights what I have here?