Men look at a tanker carrying supplies for NATO which was destroyed in an apparent bomb attack, en route to neighboring Afghanistan, at the Pakistani border town of Chaman Friday, Dec. 31, 2010. (AP Photo/Shah Khalid)
An Afghan soldier stands guard near a burnt out tanker which was carrying NATO fuel in the Behsud district of Nangarhar province, east of Kabul, Afghanistan, Thursday, Dec. 16, 2010. Officials said they believed a bomb had gone off inside or near the truck, sparking the fire. No one was injured. (AP Photo/Rahmat Gul)
President Barack Obama is greeted by NATO Commander in Afghanistan Gen. David Petraeus, left, and U.S. Ambassador to Afghanistan Karl W. Eikenberry, center, after stepping off Air Force One during an unannounced visit to Bagram Air Base in Afghanistan on Friday, Dec. 3, 2010. (AP Photo/Pablo Martinez Monsivais)
Khan Agha is taking a literacy class as part of the NATO training mission. Only 11 percent of the enlisted personnel in the army and police can read and write, compared with 35 percent for noncommissioned officers and 93 for the officer corps. (Associated Press)
President Barack Obama and NATO Secretary General Anders Fogh Rasmussen chat, center, as national leaders assemble for a group portrait at the NATO summit in Lisbon, Portugal, on Friday Nov. 19 2010. (AP Photo/Daniel Ochea de Olza)
U.S. President Barack Obama waves as he steps off the plane for a NATO summit in Lisbon on Friday, Nov. 19, 2010. U.S. President Barack Obama and the leaders of NATO's 27 other member nations will open a two-day summit Friday aimed at finding ways to keep the Cold War alliance relevant in the 21st century with revamped roles including ballistic missile defense, anti-piracy patrols, and counterterrorism. (AP Photo/Andre Kosters, Pool)
U.S. President Barack Obama, left, shakes hands with unidentified officials as he steps off the plane for a NATO summit in Lisbon on Friday, Nov. 19, 2010. U.S. President Barack Obama and the leaders of NATO's 27 other member nations will open a two-day summit Friday aimed at finding ways to keep the Cold War alliance relevant in the 21st century with revamped roles including ballistic missile defense, anti-piracy patrols, and counterterrorism. (AP Photo/Andre Kosters, Pool)
A press photographer arrives for a 'NATO Counter Summit' organized by anti-NATO demonstrators, in Lisbon, Portugal, Friday, Nov. 19, 2010. Heads of State of NATO member countries gather for a two day summit beginning Friday, and will discuss such topics as Afghanistan and missile defense. (AP Photo/Lefteris Pitarakis)
A poster depicting US President Barack Obama is seen outside the 'NATO Counter Summit' organized by anti-NATO demonstrators, in Lisbon, Portugal, Friday, Nov. 19, 2010. Heads of State of NATO member countries gather for a two day summit beginning Friday, and will discuss such topics as Afghanistan and missile defense. (AP Photo/Lefteris Pitarakis)
Anti-NATO activists prepare a stall at the 'NATO Counter Summit' organized by anti-NATO demonstrators, in Lisbon, Portugal, Friday, Nov. 19, 2010. The banner, background, reads: 'Peace'. Heads of State of NATO member countries gather for a two day summit beginning Friday, and will discuss such topics as Afghanistan and missile defense. (AP Photo/Lefteris Pitarakis)
Nato Secretary General Anders Fogh Rasmussen addresses a youth summit at the start of the main Nato summit in Lisbon, Portugal Friday Nov 19 2010. U.S. President Barack Obama and the leaders of NATO's 27 other member nations will open a two-day summit Friday aimed at finding ways to keep the Cold War alliance relevant in the 21st century. (AP Photo)
President Obama during his arrival in Lisbon, Portugal, Friday, Nov. 19, 2010, for summits with NATO partners and the European Union. (AP Photo/Pablo Martinez Monsivais)
We have different perspectives - that's natural. It is much better if we work those different perspectives out in private.
- Mark Sedwill, NATO's senior civilian representative in Afghanistan
The NIS Jugopetrol oil refinery operates in Pancevo, Serbia, where NATO bombings 11 years ago released mercury, dioxins and other cancer-causing compounds into the Danube River. (Associated Press)
NATO fuel tankers enter Afghanistan through Pakistan's border crossing in Torkham, east of Kabul, Afghanistan, on Sunday. Pakistan reopened the key border crossing to NATO supply convoys, ending an 11-day blockade that was imposed after a U.S. helicopter strike mistakenly killed two Pakistani soldiers. (Associated Press)
An Afghan police officer gestures for an oil tanker carrying fuel for NATO forces to enter Afghanistan through Pakistan's border crossing at Torkham on Sunday, Oct. 10, 2010. Pakistan reopened the key border crossing to NATO supply convoys on Sunday, ending an 11-day blockade imposed after a U.S. helicopter strike killed two Pakistani soldiers. (AP Photo/Qazi Rauf)
Pakistani fire fighters trying to extinguish fire engulfed NATO oil tankers after militants attacked a terminal in Nowshera near Peshawar, Pakistan on Wednesday, Oct. 6, 2010. Gunmen in northwest Pakistan torched a dozen tankers carrying fuel to NATO troops police said, the latest strike against supply convoys heading for Afghanistan since Pakistan shut a key border crossing last week. (AP Photo/Mohammad Sajjad)
Pakistani soldiers stand near burning NATO oil tanker allegedly attacked by militants in Nowshera near Peshawar, Pakistan on Wednesday, Oct. 6, 2010. Gunmen in northwest Pakistan torched a dozen tankers carrying fuel to NATO troops police said, the latest strike against supply convoys heading for Afghanistan since Pakistan shut a key border crossing last week. (AP Photo/Mohammad Sajjad)
Pakistani fire fighters try to extinguish fire engulfed NATO oil tankers after militants attacked a terminal in Nowshera near Peshawar, Pakistan on Wednesday, Oct. 6, 2010. Gunmen in northwest Pakistan torched a dozen tankers carrying fuel to NATO troops police said, the latest strike against supply convoys heading for Afghanistan since Pakistan shut a key border crossing last week. (AP Photo/Mohammad Sajjad)