Mullen's comments to Congress Tuesday were the first time he has gone on record saying the Afghan war needs even more American forces.
War effort requires farmers, engineers, lawyers to share expertise.
As part of the counterinsurgency mission, US Army units will return to the same regions in order to build on experience and develop stronger relationships on the ground.
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.
With many soldiers returning from Iraq and Afghanistan, the Department of Veterans Affairs has seen treatment requests and disability claims soar.
They make up 57 percent of Pentagon's personnel in Afghanistan, report shows.
Gen. Stanley McChrystal submitted his recommendations Monday for a revised strategy to turn around the conflict.
It will increase its number of bomb disposal teams by half. It is also upping its order of bomb-resistant troop carriers, called M-ATVs.
After eight years, the Pentagon is only now giving the country its full attention – and understanding Afghanistan takes time.
But American officials were quick to say that Wednesday's events were not a sign that security was unraveling in Iraq.
Starting this fall, every soldier will have to take a test designed to target potential mental or emotional problems caused by repeated deployments.
In a speech to veterans Monday, he says he intends to rein in Pentagon spending, as well as improve medical care for veterans.
Attacks are up 50 percent during the past 10 days. Coalition forces have set up a 'tiered' security plan at polling places.
The pace of the drawdown in Iraq and an effort to expand soldiers' time at home could limit troop availability in the short-term.
Federal officials scouting for alternative prisons for detainees toured a maximum security prison in Standish, Mich., that may close due to budget cuts.
They want to ensure that as many Afghans as possible can vote in next week's presidential polls.
Supporters say it's time to surge, Iraq-style. Opponents say the US should wait to see if the extra 21,000 troops already on the way have an effect.
Rolf Mowatt-Larssen, a former CIA counterterrorism expert, lays out his ideas on how to prevent the spread of nuclear materials on the black market – including the controversial 'Armageddon test.'
Human rights lawyers say the US should intervene to safeguard the Iranians at Camp Ashraf, which was raided by Iraqi security forces July 28.
The national security adviser said on Sunday that new strategies need time to work. But the US will not stay 10 years.