BBC News with Marion Marshall

At a time of budget austerity, President Obama has unveiled a revised defence strategy, which he says would cut US military spending by $450bn over 10 years. He insisted the United States would maintain its military superiority. Our security correspondent Gordon Corera has the details.

President Obama made clear that the current tide of war was recedingand this was the moment to decide what comes next. He may have ended his announcement by reminding people that even after proposed reductions, the US military budget will still be larger than the next 10 countries combined, but there was more than belt-tighteningto this exercise. A move to a smaller army is part of the shift away from the kind of manpower-intensive counter-insurgency and nation-building campaigns that define the long wars in Iraq and Afghanistan.