And as a child with a dad with MS, I can only imagine, which is why this work is so important, and there is so much at stake.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event

"And that is why it is important that we work closely with them so that they manage this upcoming period of high operational intensity, " he told BBC News in Kabul.

BBC: Afghanistan: Challenges of security handover

There are always challenges in the wings that we have not seen, so that is why it's vitally important that we do this work and we work out exactly how many people we can employ.

BBC: Metropolitan Police faces ?500m 'cuts challenge'