NEW CHIEF OF STAFF Army Gen. Martin E. Dempsey, right, and his wife, Deanie, share a laugh with Defense Secretary Robert M. Gates prior to an arrival and swearing-in ceremony for Dempsey on Fort Myer, Va., April 11, 2011. Dempsey succeeded Army Gen. George W. Casey, Jr. as the new chief of staff of the Army. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 252460-L-YHC64-886.jpg Photo Gallery