Unpublicised, David Cameron has been conducting some unusual job interviews in Downing Street. In hour-long, one-to-one, informal conversations with each candidate, he is looking for the next head of our armed forces. The man he chooses will replace Sir Jock Stirrup as Chief of the Defence Staff. So far, the Prime Minister has seen the First Sea Lord, Admiral Sir Mark Stanhope, and the Vice-Chief of the General Staff, General Nick Houghton. This week, he will see the Chief of the General Staff, General Sir David Richards. This way of doing things is unprecedented in peacetime. What normally happens is that the outgoing CDS and the Defence Secretary find the