What I'm curious about: why would the Secretary of Defence have to be a former top military officer? I know that's the tradition in the US, but that's not much of a reason (although I know traditions are hard to break). First, it's a political job. Yes, affinity with the military is obviously important, but these people not making tactical decisions and they don't draw up those equipment contracts. Lots of top diplomats could do this - as proven by other countries (which is my second point), where this job isn't necessarily filled this way. In Westminster democracies, it's actually difficult to do, as there aren't a lot of former top military officers running for MP, and you can't be a member of cabinet if you have not been elected in a riding. But also in the Netherlands, where ministers don't have to have any political background, ministers of defence rarely have any military background. I know the US is much bigger than those countries and all that jazz, but that's still not an argument for why you need a top former military officer. What's the actual argument?