RETIREMENT CERTIFICATE Air Force Chief of Staff Gen. Norton Schwartz presents the certificate of retirement to Air Force Gen. Kevin P. Chilton, outgoing commander, U.S. Strategic Command, on Offutt Air Force Base, Neb., Jan. 28, 2011. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 415902-P-EIF46-179.jpg Photo Gallery