SCP Foundation

First of all, your entire containment procedures could be replaced with "SCP-X is to be stored in a secure locker. SCP-X must not be handled directly or through clothing." as none of the things you mention appear to contribute to preventing anything anomalous, as far as I can tell from the remainder of the article.

SCP-XXXX is a Muromachi period Katana

You don't need to capitalise "katana"

during a SCP-████ investigation in [REDACTED] coded named Corvega.

I think you meant "code named" or "codenamed" not coded named

Tranquilizers were used on the subjects with no effect. Live rounds were then used bringing the [REDACTED]

This redaction doesn't imply anything interesting. To me it just looks like the test subjects got shot.

SCP-XXXX possess human subjects and attempt to kill humans in the vicinity.

Possesses, and attempts, not possess and attempt.
Also, this isn't what the Foundation would say. They'd say something like "SCP-X causes people to attack others." There's nothing here that implies "possession" has taken place and possession is not exactly a clinical term in this context.