Pre-Censored Mail WWII

We find censored mails all the time and they have censored labels to seal the opened letter and certain type of censored handstamps. How about the mails that were intercepted and, perhaps, returned to the sender. Were there any marking or indication that the mail could not e mailed? Here s a letter I believe belong to this classification. This is a 2-page letter written by a sargeant to his aunt in the US. Above the dateline, he wrote "somewhere in England". He was in the ETO force near the end of WWII, as he explained to his aunt that ETO means European Theatre Operations. The inspector was a sort of "scolded" the sargeant that he should have known better not to write theses things in a letter and bracketed out those violations on the letter. A big word REWRITE was written on the front of the envelope. Was this how the censored mails handled on a returned mail?

I believe the duties of censorship fell on the Sargent. The letters were passed to them for inspection and if approved they stamped and signed them "passed". This one was sent back for rewrite. The soldier probably saved it and carried it home.

This letter was written by a sargent.