CHAIRMAN'S SIGNATURE U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, personally signs the re-enlistment certificates for 10 soldiers assigned to the 2nd Infantry Division's 5th Stryker Brigade Combat Team stationed on Forward Operating Base Frontenac in Kandahar, Afghanistan, Dec. 17, 2009. Mullen is visiting U.S. troops with the USO holiday tour. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 607053-H-EKC77-834.jpg Photo Gallery