Armed Forces Minister MP calls the service at the National Memorial Arboretum marking 20 years since the War in Afghanistan began a moment of "self-reflection". Representing the government, he says it is "tinged" with some disappointment in light of the recent withdrawal, but nothing can take away what they achieved while there. Report by Edwardst. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn