The golden rule to remember is, that in public, you always address a senior officer by his rank, even though he may be your brother or your neighbour.
Owona mthetho ungundoqo ekufuneka uwukhumbule, ngowokuba esidlangalaleni, usoloko umbiza umphathi-mikhosi ongasentla ngesikhundla sakhe, nokuba ngumtakwenu okanye udade wenu.