The latest violence in Afghan has raised doubts about the U.S. strategy. Here, Afghan demonstrators shout anti-U.S. slogans as they carry a wounded man during a protest in the Western city of Herat on Feb. 24. Aref Karimi /AFP/Getty Images hide caption

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Defense Secretary Leon Panetta (right) and Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey listen to questions during a Senate Armed Services Committee hearing on Capitol Hill Tuesday. Both men spoke about the U.S. military shifting its focus to Asia. Mark Wilson/Getty Images hide caption

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The U.S. military wants Afghan troops to begin taking the lead role in combat operations. Here, Afghan cadets who are joining the army are shown at their graduation ceremony on Dec. 18 in the northern city of Mazar-i-Sharif. Qais Usyan/AFP/Getty Images hide caption

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The chairman of the U.S. Joint Chiefs of Staff, Gen. Martin Dempsey (left), is in Israel to talk about the growing tension with Iran. Here, Dempsey speaks with Israel's top military officer, Lt. Gen. Benjamin Gantz, during a meeting at NATO headquarters in Brussels on Wednesday. Virginia Mayo/AP hide caption

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A member of Iran's navy participates in a drill on Dec. 28, 2011, in the Sea of Oman. Tehran is threatening to close the strategic Strait of Hormuz at the mouth of the Persian Gulf, in retaliation for new sanctions by the West. Ali Mohammadi/AP hide caption

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Defense Secretary Leon Panetta and Joint Chiefs Chairman Gen. Martin Dempsey take part in a news conference at the Pentagon in Washington in November 2011. The Obama administration is unveiling its new military strategy Thursday. Critics fear it could hamper the U.S. ability to fight two wars at once. Evan Vucci/AP hide caption

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Marine Staff Sgt. Frank Wuterich talks to the media as his attorney, Neal Puckett, looks on after a 2010 pretrial hearing at Camp Pendleton in California. Wuterich is charged with voluntary manslaughter in the deaths of 24 Iraqi civilians in 2005. Chris Carlson/AP hide caption

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As many as 5,000 private security contractors will be protecting U.S. diplomats in Iraq. The U.S. Embassy compound (above) and several consulates will have about 15,000 workers, making it the largest diplomatic operation abroad. Lucas Jackson/Reuters/Landov hide caption

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Gen. David Petraeus (center, with no gun) walks with troops in 2007 in Baqouba, Iraq. The area had recently been seized back from al-Qaida control with help from U.S. forces who were part of the surge. The surge is widely credited with changing the course of the war; now, some experts are debating how much credit it deserves. Chris Hondros/Getty Images hide caption

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A day after leaving Iraq last week, U.S. Army soldiers from the 1st Cavalry Division lined up their armored vehicles near Kuwait City, Kuwait. Armored equipment will not stay behind after troops leave Iraq, but other property may. Joe Raedle/Getty Images hide caption

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Defense Secretary Leon Panetta testifies on Capitol Hill on Nov. 15. He said the proposed cuts to the Pentagon budget would lead to a hollow force. Evan Vucci/AP hide caption

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Lance Cpl. Jake Romo does physical therapy at the Naval Medical Center in San Diego, Calif. He lost both legs in an explosion in Sangin, Afghanistan, in February 2011, while serving with the 3/5 Marines. David Gilkey/NPR hide caption

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Kait Wyatt carries her 1-month-old son, Michael, at the burial for her husband, Marine Cpl. Derek Wyatt, at Arlington National Cemetery, Jan. 7. Wyatt was killed Dec. 6, 2010, in Afghanistan. Kait Wyatt, who was pregnant at the time of her husband's death, was induced the day after he was killed so she could attend the service. Evan Vucci/AP hide caption

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Amy Murray at home with her daughter Harper in Oceanside, Calif. Her husband, Capt. Patrick Murray, with the Darkhorse battalion, returned home from Afghanistan, in April 2011; 25 Marines from his unit did not.

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U.S. Marines with 3rd Battalion, 5th Regiment and the Afghan National Army provide cover as they move out of a dangerous area after taking enemy sniper fire during a security patrol in Sangin, Afghanistan, in November 2010. During its seven-month deployment, the 3/5 sustained the highest casualty rate of any Marine unit during the Afghan war, losing 25 men.

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