The EU's monitor for Afghanistan election suggests that 1.1 million of the incumbent president's votes must be investigated.
Mullen's comments to Congress Tuesday were the first time he has gone on record saying the Afghan war needs even more American forces.
The Defense secretary responded Thursday to mounting doubts about the war by saying that the US must stay in order to defeat Al Qaeda, which remains a threat.
A new strategy in Afghanistan to combat the opium trade draws on US experience curbing cocaine shipments in Latin America.
After eight years, the Pentagon is only now giving the country its full attention – and understanding Afghanistan takes time.
Unmanned aerial drones have become important weapons in the US counterterrorism effort. But questions are mounting about who controls the drones, and what laws govern their use.
The national security adviser said on Sunday that new strategies need time to work. But the US will not stay 10 years.
Marines banned social networking sites from their computers Tuesday due to security concerns, and the Pentagon announced a policy review. But Pentagon's top officer will still tweet.