Britain's Prime Minister David Cameron, center, arrives to deliver a speech to British and US troops during a visit at Camp Bastion, outside Lashkar Gah, the provincial capital of Helmand province in south Afghanistan, Monday, July 4, 2011. (AP Photo/Lefteris Pitarakis, pool)

Associated Press
Britain's Prime Minister David Cameron, center, arrives to deliver a speech to British and US troops during a visit at Camp Bastion, outside Lashkar Gah, the provincial capital of Helmand province in south Afghanistan, Monday, July 4, 2011. (AP Photo/Lefteris Pitarakis, pool)
Britain's Prime Minister David Cameron, center, arrives to deliver a speech to British and US troops during a visit at Camp Bastion, outside Lashkar Gah, the provincial capital of Helmand province in south Afghanistan, Monday, July 4, 2011. (AP Photo/Lefteris Pitarakis, pool)
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