The last U.S. Army convoy vehicle drives down the road after crossing into Kuwait from Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

Soldiers with the 3rd Brigade Combat Team, 1st Cavalry Division perform a security check on their Mine Resistant Ambush Protected (MRAP) vehicles near the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

Kuwaiti and U.S. soldiers close the border gate after the last vehicle crossed into Kuwait during the US miltary's withdrawal from Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty.
REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY TPX IMAGES OF THE DAY) 

A border guard stands on the border of Kuwait behind a U.S. flag on the dashboard of a Mine Resistant Ambush Protected (MRAP) vehicle from the 3rd Brigade Combat Team, 1st Cavalry Division that is part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

A soldier with the 3rd Brigade Combat Team, 1st Cavalry Division folds up a U.S. flag outside their Mine Resistant Ambush Protected (MRAP) vehicle before leaving Camp Adder to travel with the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

Soldiers with the 3rd Brigade Combat Team, 1st Cavalry Division pose with a U.S. flag outside their Mine Resistant Ambush Protected (MRAP) vehicle before leaving Camp Adder to travel with the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

Captain Mark Askew gives soldiers from the 3rd Brigade Combat Team, 1st Cavalry Division a mission brief before leaving Camp Adder to travel with the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

Specialist Dante Battle with the 3rd Brigade Combat Team, 1st Cavalry Division watches the sun rise from within his Mine Resistant Ambush Protected (MRAP) vehicle as his crew nears the Kuwaiti border while traveling in the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS ENVIRONMENT) 

Specialist Christopher Conner smiles with Specialist Dante Battle (R) as their Mine Resistant Ambush Protected (MRAP) vehicle approaches the Kuwaiti border with the 3rd Brigade Combat Team, 1st Cavalry Division as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

U.S. Army soldier stands outside his vehicle after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

Staff Sergeant Prince House with the 3rd Brigade Combat Team, 1st Cavalry Division smiles as his Mine Resistant Ambush Protected (MRAP) vehicle nears the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS TPX IMAGES OF THE DAY) 

Specialist Robert Rodriguez smiles as he mans the gun of a Mine Resistant Ambush Protected (MRAP) vehicle with the 3rd Brigade Combat Team, 1st Cavalry Division near the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

Soldiers with the 3rd Brigade Combat Team, 1st Cavalry Division perform a security check on their Mine Resistant Ambush Protected (MRAP) vehicles near the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

A U.S. Army soldier gets out of his vehicle after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty.
REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

The Kuwaiti desert stretches beyond a U.S. flag on the dashboard of a Mine Resistant Ambush Protected (MRAP) vehicle from the 3rd Brigade Combat Team, 1st Cavalry Division that is part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

U.S. Army soldiers stand outside their vehicles after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

A U.S. Army soldier stands outside his vehicle after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

A U.S. Army soldier smiles after crossing into Kuwait as the last convoy pulls out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

U.S. Army cross into Kuwait as the last convoy pulls out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

U.S. Army convoys are given the thumbs up from a fellow soldier after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

A U.S. Army soldier waves to supporters after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

A U.S. Army soldier celebrates after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

Staff Sergeant Prince House from the 3rd Brigade Combat Team, 1st Cavalry Division assembles his team back to their Mine Resistant Ambush Protected (MRAP) vehicle after crossing the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (KUWAIT - Tags: MILITARY CONFLICT POLITICS TPX IMAGES OF THE DAY) 

Specialist Marion Church (C) and Specialist Robert Yow from the 3rd Brigade Combat Team, 1st Cavalry Division laugh outside their Mine Resistant Ambush Protected (MRAP) vehicle after crossing the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

U.S. Army General Lloyd Austin, commander of the U.S. forces in Iraq, greets the last group of soldiers from the 3rd Brigade Combat Team, 1st Cavalry Division to cross the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

U.S. Army General Lloyd Austin, commander of the U.S. forces in Iraq, greets the last group of soldiers from the 3rd Brigade Combat Team, 1st Cavalry Division to cross the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (KUWAIT - Tags: MILITARY CONFLICT POLITICS PROFILE) 

Soldiers from the 3rd Brigade Combat Team, 1st Cavalry Division unload their weapons after crossing the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

A line of Mine Resistant Ambush Protected (MRAP) vehicles from the 3rd Brigade Combat Team, 1st Cavalry Division that are part of the last U.S. military convoy to leave Iraq drive south on Highway 1 towards Kuwait December 18, 2011. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

Iraqis wave behind a U.S. flag on the dashboard of a Mine Resistant Ambush Protected (MRAP) vehicle from the 3rd Brigade Combat Team, 1st Cavalry Division as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

Specialist Dante Battle from the 3rd Brigade Combat Team, 1st Cavalry Division secures the perimeter outside of a Mine Resistant Ambush Protected (MRAP) vehicle on the way to cross the Kuwaiti border as part of the last U.S. military convoy to leave Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Lucas Jackson (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

Soldiers from the 3rd Brigade, 1st Cavalry Division gesture in the convoy staging area before departing Camp Adder, now known as Imam Ali Base, near Nasiriyah, Iraq December 17, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending their withdrawal after nearly nine years of war and military intervention that cost almost 4,500 American and tens of thousands of Iraqi lives. Picture taken December 17, 2011. REUTERS/Mario Tama/Pool (IRAQCIVIL UNREST - Tags: CONFLICT MILITARY POLITICS) 

A United States soldier gestures as he crosses the Iraqi border into Kuwait December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty.
REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

United States military officers welcome vehicles entering Kuwait during their withdrawal from Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty.
REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

A United States military officer welcomes vehicles entering Kuwait during their withdrawl from Iraq December 18, 2011. The last us military convoy leaves Iraq, ending the American withdrawal nearly nine years after invasion, a- U.S. military official said on Sunday. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

The last convoy of U.S. military trucks cross the Iraqi border into Kuwait December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

A United States soldier drives his truck across the Iraqi border into Kuwait December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

A U.S. Army soldier waves an American flag after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. . REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

A U.S. Army soldier waves an American flag after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. . REUTERS/Shannon Stapleton (KUWAIT - Tags: MILITARY CONFLICT POLITICS) 

A United States military vehicle crosses the border into Kuwait during the withdrawal from Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

A United States soldier gestures as he crosses the Iraqi border into Kuwait December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

United States soldiers returning from Iraq speak with a member of a unit facilitating the withdrawal inside Kuwait near the Iraqi border December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

United States soldiers returning from Iraq unload the ammunition from their weapons inside Kuwait near the Iraqi border December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

United States military vehicles enter Kuwait during their withdrawal from Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

United States military vehicles cross the border into Kuwait during their withdrawal from Iraq December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

United States soldiers returning from Iraq unload the ammunition from their weapons inside Kuwait near the Iraqi border December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

United States military vehicles arrive at the border in Kuwait during their withdrawl from Iraq December 18, 2011. The last us military convoy leaves Iraq, ending the American withdrawal nearly nine years after invasion, a- U.S. military official said on Sunday. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY TPX IMAGES OF THE DAY) 

A United States military officer welcomes vehicles entering Kuwait during their withdrawl from Iraq December 18, 2011. The last us military convoy leaves Iraq, ending the American withdrawal nearly nine years after invasion, a- U.S. military official said on Sunday. REUTERS/Caren Firouz (KUWAIT) 

A United States military officer welcomes vehicles entering Kuwait during their withdrawl from Iraq December 18, 2011. The last us military convoy leaves Iraq, ending the American withdrawal nearly nine years after invasion, a- U.S. military official said on Sunday. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

A United States military officer gestures upon entering Kuwait during their withdrawl from Iraq December 18, 2011. The last us military convoy leaves Iraq, ending the American withdrawal nearly nine years after invasion, a- U.S. military official said on Sunday. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

A United States military officer removes his weapon upon entering Kuwait during their withdrawl from Iraq December 18, 2011. The last us military convoy leaves Iraq, ending the American withdrawal nearly nine years after invasion, a- U.S. military official said on Sunday. REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

U.S. Army soldiers perform a casing of the colors ceremony signifying the departure of the 3rd Brigade Combat Team, 1st Cavalry Division as they depart in the last convoy from Camp Adder near Nasiriyah, Iraq on December 17, 2011. REUTERS/Lucas Jackson/Pool (IRAQ - Tags: MILITARY POLITICS CONFLICT) 

Soldiers from the 3rd Brigade Combat Team, 1st Cavalry Division hold their unit's flag for a photograph while waiting at a staging area in Camp Adder to be part of the last U.S. military convoy to leave the country near Nasiriyah, Iraq on December 17, 2011. REUTERS/Lucas Jackson/Pool (IRAQ - Tags: MILITARY POLITICS CONFLICT) 

Sets of body armor belonging to members of the 3rd Brigade Combat Team, 1st Cavalry Division rest on the ground as soldiers depart Camp Adder to be part of the last U.S. military convoy to leave the country near Nasiriyah, Iraq on December 17, 2011. REUTERS/Lucas Jackson/Pool (IRAQ - Tags: MILITARY CONFLICT POLITICS) 

Soldiers from the 3rd Brigade Combat Team, 1st Cavalry Division smile while posing for a photograph while waiting at a staging area in Camp Adder to be part of the last U.S. military convoy to leave the country near Nasiriyah, Iraq on December 17, 2011. REUTERS/Lucas Jackson/Pool (IRAQ - Tags: MILITARY POLITICS CONFLICT) 

Private Martin Borglit of the 3rd Brigade Combat Team, 1st Cavalry Division installs the mounted gun on his units Mine Resistant Ambush Protected vehicle (MRAP) to be part of the last U.S. military convoy to leave Camp Adder near Nasiriyah, Iraq on December 17, 2011. REUTERS/Lucas Jackson/Pool (IRAQ - Tags: MILITARY POLITICS CONFLICT) 

Soldiers from the 3rd Brigade Combat Team, 1st Cavalry Division depart Camp Adder in their Mine Resistant Ambush Protected vehicles (MRAP) as part of the last U.S. military convoy to leave the country near Nasiriyah, Iraq on December 17, 2011. REUTERS/Lucas Jackson/Pool (IRAQ - Tags: MILITARY POLITICS CONFLICT) 

A United States soldier gestures as he crosses the Iraqi border into Kuwait December 18, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty.
REUTERS/Caren Firouz (KUWAIT - Tags: POLITICS CONFLICT MILITARY) 

The sun sets over an empty staging area in Camp Adder which is the departure point for the last U.S. military convoy to leave the country near Nasiriyah, Iraq on December 17, 2011. REUTERS/Lucas Jackson/Pool (IRAQ) 

Soldiers from the 3rd Brigade, 1st Cavalry Division, prepare to depart in the last convoy from Iraq, at Camp Adder, now known as Imam Ali Base, near Nasiriyah December 17, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending their withdrawal after nearly nine years of war and military intervention that cost almost 4,500 American and tens of thousands of Iraqi lives. Picture taken December 17, 2011. REUTERS/Mario Tama/Pool (IRAQCIVIL UNREST - Tags: CONFLICT MILITARY POLITICS) 

Specialist Shunterika Lewis from the 3rd Brigade, 1st Cavalry Division laughs while preparing to depart in the last convoy from Iraq at Camp Adder, now known as Imam Ali Base, near Nasiriyah December 17, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending nearly nine years of war that cost almost 4,500 American and tens of thousands of Iraqi lives and left a country still grappling with political uncertainty. Picture taken December 17, 2011. REUTERS/Mario Tama/Pool (IRAQ - Tags: CONFLICT MILITARY POLITICS)