I don't believe that a Corbyn is unelectable - it's not so long ago that he was something of a 'joke' candidate allowed in to widen the debate before a 'proper' person took the post - now he looks like winning. In 5 years time if the electorate is tired of 'austerity' (despite an ever increasing debt) and fed up of DC/ Osborne they may well vote for Labour. Defence is rarely a major issue at elections and as some of the above comments show there are plenty of people who could be taken in by his sincere and reasonable manner and make him PM. At that point a great deal of what we know in the UK will go, not just in defence. The man is an anti-American republican who believes in uni-lateral disarmament in favour of a high tax state with pretty much all major service industries nationalised. It's no wonder the unions love him & their support would prevent Labour MPs removing him even if those that didn't support Corbyn had been allowed to retain their seats in the preceding 5 years.