One of Kyrgyzstan’s top defense officials told Defense Secretary Leon E. Panetta on Tuesday that a crucial United States air base here should have “no military mission” when its lease expires a little more than two years from now. The request creates a potential hurdle to American plans to withdraw from Afghanistan in 2014. Notes from Afghanistan, Pakistan, Iraq and other areas of conflict in the post-9/11 era. The base, officially called a transit center, is at the Manas airport close to the Kyrgyz capital, Bishkek, and has been a vital hub for troops and matériel moving in and out...