This undated picture issued by Britain's Ministry of Defence, Monday, Aug. 17, 2009, shows Sergeant Simon Valentine, left, of 2nd Battalion The Royal Regiment of Fusiliers, who has been named as the 201st British soldier to be killed in Afghanistan. Britain's Prime Minister Gordon Brown affirmed Britain's commitment to Afghanistan Sunday, on a weekend in which roadside bombs killed five more soldiers, pushing the U.K. death toll past 200. The grim milestone has reignited debate about the heavy human cost of a conflict the government claims is vital to defeating terrorism but that critics say is unwinnable.