Afghan policemen keep watch on a road le

Afghan policemen keep watch on a road leading to the US air base in Bagram, 50 kms north of Kabul, on May 19, 2010. Taliban militants armed with rockets, guns and grenades attacked the largest NATO base in Afghanistan on May 19, sparking gun battles that killed seven insurgents and wounded seven NATO soldiers. The daring assault on Bagram airbase came a day after a suicide car bombing killed five US soldiers, a Canadian colonel and 12 Afghans, highlighting the increasing sophistication and relentless pace of the nearly nine-year insurgency. AFP PHOTO/SHAH Marai (Photo credit should read SHAH MARAI/AFP via Getty Images)