100421-N-6031Q-003 KABUL, Afghanistan -- Col. Thomas x. Hammes (Ret.), Senior Research Fellow at the National Strategic Studies, National Defense University, right, participates in a discussion with service members from U.S. Air Force and the Afghan National Army Air Corps about the development of the Air Corps over the last few years. Hammes visited the Air Corps base in Kabul, Afghanistan on April 21, 2010. (US Navy photo by Mass Communication Specialist 2nd Class David Quillen/ RELEASED).