CEREMONIAL SLICE Army Chief of Staff Gen. George W. Casey, second from left, Defense Secretary Robert M. Gates, center, Army Secretary John M. McHugh and Sgt. Maj. of the Army Kenneth O. Preston use a sword to cut the cake for the Army's 235th birthday ceremony at the Pentagon, June 14, 2010. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 471548-E-HWO99-775.jpg Photo Gallery