TROOP VISIT U.S. Navy Adm. Mike Mullen, left, chairman of the Joint Chiefs of Staff, addresses soldiers assigned to 1st Battalion, 52nd Aviation Regiment on Chaklala Air Base in Islamabad, Pakistan, Dec.15, 2010. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 089066-I-HTE81-931.jpg Photo Gallery