We had an Army passenger turn up at Gutersloh on the air trooping bus; he went into the toilets and changed into something really different to what he was wearing when he arrived (torn t-shirt, smelly jeans, trainers with the toe-end cut away and safety pins stuck into his ears and lips).
When he walked past me towards the check-in desk, I was speechless and before I could do anything, the SAMO (who was stood just behind me) reacted with remarkable speed, to ask who he was, where he was from, how he got to the terminal; then promptly escorted him back to the bus he had just got off and told him in no uncertain terms that the Services had standards, he did not represent those and that he should go back to his unit and report to his RSM and tell him what had happened; SAMO got a round of applause from everybody in the terminal.
