TROOP TIME U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, visits service members on Camp Lemonnier, Djibouti, Feb. 24, 2011. Mullen is on a weeklong trip through the Middle East to reassure friends and allies of the U.S. commitment to regional stability. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 230359-U-HBR18-187.jpg Photo Gallery