United States Army

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Chyba, a 12-year-old former military dog who served in Iraq with the U.S. Army, was adopted by Madeleine Pickens, wife of billionaire T. Boone Pickens, last year. (Associated Press)

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U.S. Army Sgt. Joseph Bozicevich (AP Photo/U.S. Army)

** FILE ** U.S. Defense Secretary Robert M. Gates (left), U.S. Ambassador to Saudi Arabia James Smith (center) and U.S. Army Maj. Gen. Robert G. Catalanotti walk across an airport tarmac in Riyadh, Saudi Arabia, on Wednesday, April 6, 2011. (AP Photo/Chip Somodevilla, Pool)

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Personnel from the U.S. Army Corps of Engineers check sandbags along the shore of the rising Mississippi River in Natchez, Miss., on Wednesday, May 18, 2011. (AP Photo/Gerald Herbert)

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** FILE ** U.S. Army Lt. Daniel McCord (left), Staff Sgt. Marc Krugh (center) and Sgt. Christopher Torrentes of the 3rd Armored Cavalry Regiment pray before heading out on a patrol at Contingency Operating Site Kalsu, south of Baghdad, Iraq, on Tuesday, Jan. 25, 2011. (AP Photo/Maya Alleruzzo, File)

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An Afghan boy with severe burns is treated in a U.S. Army medevac helicopter en route to a hospital Wednesday. Officials said the Taliban has started its spring offensive of terrorism.

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This image provided by the U.S. Army shows U.S. soldiers and service members as they watch the cable news coverage of the death of al Qaeda leader Osama bin Laden on a television at the Bagram air field on Monday. Bin Laden was slain in his hideout in Pakistan early Monday in a firefight with U.S. forces, ending a manhunt that spanned a decade. (Associated Press)

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In this image taken from video, an explosion lights up the night sky as the U.S. Army Corps of Engineers blows an 11,000-foot hole in the Birds Point levee in Mississippi County, Mo., on Monday, May 2, 2011, to protect Cairo, Ill. (AP Photo/St. Louis Post-Dispatch, David Carson)

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Jacob Borror (left) shares a grit cake with his father, Matt Borror, as they portray U.S. Army soldiers guarding Fort Sumter on Monday, April 11, 2011, in Charleston, S.C. (AP Photo/The Post and Courier, Grace Beahm)

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U.S. Army Gen. Stanley A. McChrystal

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Rear Admiral Paul Zukunft of the U.S. Coast Guard, left, Lieutenant General Richard Y. Newton III of the U.S. Air Force, Vice Admiral Michael Vitale of the U.S. Navy, Lieutenant General Terry G. Robling of the U.S. Marine Corps, and Major General Karl Horst of the U.S. Army throw out the first pitches before the Washington Nationals Atlanta Braves opening day baseball game at Nationals Park in Washington, D.C., Thursday, March 31, 2011. (Rod Lamkey Jr/The Washington Times)

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Two MV-22 Osprey vertical-takeoff-and-lift aircraft land, one carrying U.S. Army Gen. Carter Ham, commander of the U.S. military mission in Libya, at the Sigonella air base on the Italian island of Sicily on Thursday, March 24, 2011. (AP Photo/Andrew Medichini)

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U.S. Army Gen. David H. Petraeus, commander of U.S. and NATO forces in Afghanistan, arrives on Capitol Hill in Washington on Tuesday, March 15, 2011, to testify before the Senate Armed Services Committee on the situation in Afghanistan. At left is Defense Under Secretary for Policy Michele Flournoy. (AP Photo)

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This photo provided by the Buckles family shows Frank Woodruff Buckles when he enlisted in the U.S. Army in August 1917. Mr. Buckles was the last known living American veteran of World War I. (AP Photo/Courtesy of the Buckles family)

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U.S. Army Gen. David H. Petraeus, commander of U.S. and NATO forces in Afghanistan, testifies Tuesday on Capitol Hill before the Senate Armed Services Committee. (Associated Press)

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Defense Secretary Robert M. Gates (right) talks with U.S. Army Gen. David H. Petraeus upon the Pentagon chief's arrival in Kabul, Afghanistan, on Monday, March 7, 2011. (AP Photo/Defense Department/Cherie Cullen)

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A journalist interviews American army officer Lt. Col. Micheal Rowells, center, as he plays with Tiger Woods, left, during the Pro-Am at the Emirates Golf Club a day ahead of Dubai Desert Classic golf tournament in Dubai, United Arab Emirates, Wednesday Feb. 9, 2011. (AP Photo/Kamran Jebreili)

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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)