'U.S. troops have killed as many as 30 insurgents after calling in air strikes to repel a Taliban attack on their outpost in southeast Afghanistan on Saturday, it was revealed today. Five US troops were wounded in the attack when the base in Paktika province came under fire from rocket-propelled grenades, gunfire and mortars, military sources said. Rising violence and record casualties among foreign troops and civilians are likely to weigh heavily on U.S. President Barack Obama's review of his Afghanistan war strategy in December and at a NATO summit in Lisbon next month. A spokesman from the NATO-led International...