When I was a newly commissioned Lieutenant in the Army, I was assigned as a temporary assistant in an administrative office in a Military Intelligence unit. One day a long form came around with a cover sheet instructing all assigned officers to read it and initial it as indication of their compliance. I figured it meant me too, so I read and initialed it.
However, a few days later, it came back addressed specifically to me. An attached note read: "You are not permanently assigned to this unit and are thus not an authorized signee. Please erase your initials and initial your erasure."
So I did.