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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Lt. Col. Jason Morris pays his respects at a memorial service in Sangin, Afghanistan, on Nov. 26, 2010, for three Marines who were killed: Lance Cpl. Brandon Pearson, Lance Cpl. Matthew Broehm and 1st Lt. Robert Kelly. Morris commanded a battalion in volatile Helmand province that suffered the highest casualty rate of any Marine unit in the Afghanistan War.

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Marines with 3rd Battalion, 5th Marine Regiment, kneel before battlefield memorials for their fallen brothers during a farewell ceremony, Oct. 30, 2010.

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A U.S. Marine Osprey at Camp Leatherneck in southern Afghanistan. The aircraft suffered multiple problems when it was being developed, but is now getting praise from those flying it.

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Secretary of State Hillary Clinton speaks in Islamabad Friday, as Pakistan Foreign Minister Hina Rabbani Khar looks on. Clinton urged Pakistan to act swiftly to dislodge the militant Haqqani network.

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The assassination of Ahmed Wali Karzai (center, shown in 2009), the half-brother of Afghan President Hamid Karzai, prompted fears of a security breakdown in the southern Afghan city of Kandahar. Ahmed Wali Karzai was rumored to have a hand in everything that went on in the region: tribal affairs, politics and business.

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Afghanistan's Panjwai district, southwest of Kandahar city, was a Taliban stronghold until the U.S. troop surge in 2010 began to displace the insurgents.

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The documentary Hell and Back Again follows U.S. Marine Sgt. Nathan Harris and his wife, Ashley, as the two grapple with the physical and emotional fallout of his injuries in Afghanistan.

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