A good RSM runs the whole place re dress etc. Walking along about ten paces behind a young Lieutenant one day, RSM coming in opposite direction, RSM bangs up an immaculate salute and calls across, "Mr.XXXX Sir, I have the barber booked for 11.00 hours, perhaps you would care to join me?!"
Best screen version of an RSM I can remember was Richard Attenborough in a film that I think was called, "The Hill" but may have been, "The Guns of Batasi"?