United States Army

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An Iraqi soldier and a U.S. Army soldier (foreground) stand guard during a patrol in Mosul, northwest of Baghdad, in 2009. Two U.S. soldiers were killed Saturday by an Iraqi soldier during a training exercise, raising fresh concerns about Iraq's security forces. (Associated Press)

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U.S. Army and Afghan army soldiers attached to the 1st Battalion, 502nd Infantry Regiment, 101st Airborne Division, congratulate each other during a training program graduation in Panjwai district in Afghanistan's Kandahar province on Monday, Nov. 29, 2010. (AP Photo/Alexander Zemlianichenko)

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** FILE ** U.S. Army Maj. Nidal Hasan is pictured at the Bell County Jail in Belton, Texas, in April 2010. (AP Photo/Bell County Sheriff's Department)

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In this Wednesday, July 28, 2010 file picture, U.S. Army Lt. Christopher Babcock looks at the body of a suspected Taliban fighter killed by U.S. soldiers from 1-320th Alpha Battery, 2nd Brigade of the 101st Airborne Division, while local people say the man was a farmer from Samir Kalacha village in the volatile Arghandab Valley, Kandahar, Afghanistan. (AP Photo/Rodrigo Abd, File)

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n this Sunday, Sept. 10, 2006 file picture, a girl holds her grandfather's cane as he carries aid supplies distributed by the U.S. Army at Kandagal, Afghanistan. (AP Photo/Saurabh Das, File)

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In this Sept. 23, 2009 file photo, soldiers from the U.S. Army's 3rd Battalion, 509th Infantry Regiment (Airborne, based at Fort Richardson, Alaska, fire a 120mm mortar during a fire mission at the combat outpost Zerok in East Paktika province in Afghanistan. (AP Photo/Dima Gavrysh, File)

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In this Sunday, Sept. 22, 2002 file picture, U.S. Army soldiers of Task Force Panther 82nd Airborne Division take a local man suspected of sheltering al-Qaida members into questioning after seaerching a compound in the southeast region of Afghanistan. (AP Photo/Wally Santana, File)

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A U.S. Army helicopter prepares to leave a forward operating base in Afghanistan. Republican lawmakers say there are not enough troops to man a counter-rocket, -artillery and -mortar battery used effectively by soldiers in Iraq to intercept enemy rounds headed for forward operating bases. (Associated Press)

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U.S. Army soldiers secure a road at the scene of a suicide attack in Kandahar, Afghanistan, Saturday, Sept. 4, 2010. (AP Photo/Allauddin Khan)

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A newly graduated female army officer of Afghan National Army, Mariam Ghulam Rasool, right, poses for a photograph with one of her instructors from the American Army after their graduation ceremony at National Army's training center in Kabul, Afghanistan, on September 23, 2010. UPI/Hossein Fatemi

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A newly graduated female army officer of Afghan National Army, Mariam Ghulam Rasool, right, pose for a photograph with one of her instructors of the American Army after their graduation ceremony at National Army's training center in Kabul, Afghanistan, Thursday Sept. 23, 2010. (AP Photo/Gemunu Amarasinghe)

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** FILE ** A U.S. Army Black Hawk helicopter prepares to depart from a forward operating base in the Zhari district of southern Afghanistan on Sept. 11, 2010. (AP Photo/Brennan Linsley)

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**FILE** U.S. Army soldiers and Iraqi security forces secure the scene of a roadside bomb attack in Basra, Iraq, in September. (Associated Press)

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U.S. Navy Adm. Mike Mullen (L), chairman of the Joint Chiefs of Staff and U.S. Army Gen. David Petraeus, commander, International Security Assistance Force depart ISAF headquarters in Kabul, Afghanistan meet in Kabul, Afghanistan on on September 3, 2010. UPI/Chad J. McNeeley/U.S. Navy

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U.S. Army soldiers secure a road at the scene of a suicide attack in Kandahar, Afghanistan, on Saturday, Sept. 4, 2010. At least three people were killed and 11 wounded in the car-bomb attack on a U.S. Army convoy, according to local hospitals. NATO said there were no injuries to coalition forces or damage to their vehicles. (AP Photo/Allauddin Khan)

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A U.S. Army helicopter takes off carrying soldiers wounded in a roadside bombing in Kandahar, Afghanistan, on Monday, Aug. 30, 2010. Eyewitnesses said a U.S. military armored Humvee caught fire after having been struck by the bomb in a residential area of Kandahar, Afghanistan's second-largest city, while returning in a convoy from an unknown mission. (AP Photo/Allauddin Khan)

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A U.S. Army soldier of the 101st Airborne Division walks along a road during a day of joint missions with the Afghan army in the Zhari district of Kandahar province in southern Afghanistan on Thursday, Aug. 26, 2010. (AP Photo/Brennan Linsley)

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U.S. Army Sgt. Billy Bennett shows Iraqi federal policemen how to walk in a "wedge" formation on patrol during a training exercise on Wednesday, Aug. 11, 2010. (AP Photo/Lara Jakes)

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The last in a convoy of U.S. Army Stryker armored vehicles leave Iraq at the Khabari border crossing into Kuwait, Thursday, Aug. 19, 2010. The U.S. Army's 4th Brigade, 2nd Infantry Division is the last combat brigade to leave Iraq as part of the drawdown of U.S. forces. (AP Photo/ Maya Alleruzzo)

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ASSOCIATED PRESS PHOTOGRAPHS U.S. Army Sgt. Jason Thompson (left) and Lt. Col. Nate Flegler wave to one of the last Stryker armored vehicles to leave Iraq.