POW/MIA OBSERVANCE Chairman of the Joint Chiefs of Staff U.S. Marine Gen. Peter Pace, Patricia Scharf, widow of Col. Charles Scharf, and Defense Secretary Robert M. Gates, watch a pass-in-review of the troops during a POW/MIA ceremony at the Pentagon, Sept. 21, 2007. SHARE: Download: Full Size (0.02 MB) Credit: VIRIN: 617871-L-RGC01-846.jpg Photo Gallery