Very interesting. Not sure if I agree with the conclusion about being at war with China though. Don't think I've seen this labelling of redactions with reasons before. If they want to keep something secret, why would they define what kind of secret they're trying to keep secret? It just aids in figuring out what that secret is...

This is retarded lol. The redactions are under the federal FOIA statute, which here refer to redaction for other statutory cause and redaction for trade secrets or financial information.

Diff places have diff redaction codes, IIRC. They are referring to national archives RCs, while these emails were FOI'd. Not sure the same codes apply.