I've told the story before of one of my (rather long in the tooth) SAC's from 20 years ago, the infamous Colin Andrews.
Colin was an exceptionally natty dresser in civvies; blazer, flannels, striped tie etc, the full rig. Colin was being sent on detachment to FI. By coincidence, part of the Resident Infantry Company roulement were scheduled to depart on the Tri* the same evening.
The departing RIC, were to be seen off by their CO, a Lt Colonel Andrews.
Colin had the habit of labelling himself, and his baggage, with his nickname of 'Col'.
This habit caused a few red faces amongst the Movements staff, at the secret Oxonian airbase, as they removed him from the VIP Lounge to which Colin had been escorted to on arrival.
Colin certainly enjoyed the hour it took to discover the error.