Part of this is true!
For a while I worked in the Civil Service (pre-privatised BT). I went in as an H.E.O (Higher Executvive Officer) and had several E.Os (Executive Officers) reporting to me.
Over on the more techy side we had Information Officers (I.Os).
One day I saw a guy wandering down the corridor with some sheep. "Who's that?" I enquired of a chum. "Oh, that's old McDonald" came the reply. "He's an E.I. E.I O.!!
(OK, I made up the last bit, but I expect you noticed)