Discharges 33. Mr. MARKHAM asked the Under-Secretary of State for Air if he will say whether there is any regulation, and, if so, its terms, which lays down the procedure to be adopted in the case of men found to be unsuitable or incompetent after entering the service; and whether it applies to mechanics and other engineering units? Mr. WILLIAM WHITELEY (Lord of the Treasury) I have been asked to reply. Yes, Sir. The regulation in question is paragraph 504 of the King's Regulations and Air Council Instructions for the Royal Air Force. I am sending my hon. Friend a copy of the paragraph in question, and he will see that it lays down the procedure to be followed in the eases which he has in mind. It applies to airmen of all trade classifications.