FILE - In this Wednesday, Sept. 14, 2011 file photo, U.S. Gen. John Allen, then top commander of U.S. and NATO forces in Afghanistan, speaks during a news conference in Kabul, Afghanist

 

              FILE - In this Wednesday, Sept. 14, 2011 file photo, U.S. Gen. John Allen, then top commander of U.S. and NATO forces in Afghanistan, speaks during a news conference in Kabul, Afghanist
FILE - In this Wednesday, Sept. 14, 2011 file photo, U.S. Gen. John Allen, then top commander of U.S. and NATO forces in Afghanistan, speaks during a news conference in Kabul, Afghanistan. Allen is under investigation for thousands of alleged "inappropriate communications" he had with a Florida socialite also involved in the David Petraeus case. Nearly two dozen generals have commanded troops from the United States and the NATO-led International Security Assistance Force, since the American invasion in late 2001. While some analysts say fresh eyes are important, others wonder if the revolving door command has hurt U.S. continuity with critical Afghan partners. (AP Photo/Musadeq Sadeq, File)