Flight Surgeon Maj. Timothy Ballard administers the final anthrax inoculation to Secretary Cohen. U.S. Air Force Flight Surgeon Maj. Timothy Ballard (right) administers the final shot in the six-dose series of anthrax inoculations to Secretary of Defense William S. Cohen (left) as Chairman of the Joint Chiefs of Staff Gen. Henry Shelton (center), U.S. Army, waits his turn in the Pentagon on Sept. 24, 1999. Following this shot, a once-a-year booster is all that will be required to maintain resistance to anthrax. Ballard is attached to the 11th Medical Group. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 660144-M-YZP44-540.jpg Photo Gallery