US Defence Secretary makes unannounced visit to Afghanistan

Leon Panetta is expected to meet with troops to thank them for their service
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Defense Secretary Leon Panetta (R) talks with U.S. Ambassador to Afghanistan James B. Cunningham, (C), and Marine Gen. John R. Allen, (L), commander of International Security Assistance Force upon his arrival at Kabul International Airport on December 12, 2012 in Kabul, Afghanistan. The Defense Secretary is expected to meet with troops to thank them for their service. (Getty Images)
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Defense Secretary Leon Panetta (R) is greeted by Marine Gen. John R. Allen (L) commander of International Security Assistance Force, upon his arrival at Kabul International Airport on December 12, 2012 in Kabul, Afghanistan. The Defense Secretary met with troops to thank them for their service during a four day visit to Kuwait. (Getty Images)
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Defense Secretary Leon Panetta (R) smiles as he is greeted by U.S. Ambassador to Afghanistan James B. Cunningham, (C), and Marine Gen. John R. Allen, (L), commander of International Security Assistance Force upon his arrival at Kabul International Airport on December 12, 2012 in Kabul, Afghanistan. The Defense Secretary is expected to meet with troops to thank them for their service. (Getty Images)
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Defense Secretary Leon Panetta walks off his plabe as U.S. Ambassador to Afghanistan James B. Cunningham, (L), looks on upon his arrival at Kabul International Airport on December 12, 2012 in Kabul, Afghanistan. The Defense Secretary met with troops to thank them for their service during a four day visit to Kuwait. (Getty Images)
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Defense Secretary Leon Panetta, second from right, standing across from Marine Gen. John R. Allen, left, commander of International Security Assistance Force, left, speaks before a dinner with commander at International Security Assistance Force headquarters on December 12, 2012 in Kabul, Afghanistan. The Defense Secretary is expected to meet with troops to thank them for their service. (Getty Images)
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Defense Secretary Leon Panetta, second from right, meets with commanders, including Marine Gen. John R. Allen, third from right, commander of International Security Assistance Force before a dinner with them at International Security Assistance Force headquarters on December 12, 2012 in Kabul, Afghanistan. The Defense Secretary is expected to meet with troops to thank them for their service. (Getty Images)