Defense Secretary Robert M. Gates addresses the audience during the promotion ceremony of Army Col. Mark Milley to the rank of brigadier general on Fort Campbell, Ky. Feb. 1, 2008. Defense Secretary Robert M. Gates addresses the audience during the promotion ceremony of Army Col. Mark Milley to the rank of brigadier general on Fort Campbell, Ky. Feb. 1, 2008. SHARE: Download: Full Size (0.5 MB) Tags: Photo Essays Credit: VIRIN: 801804-O-BEO97-608.jpg Photo Gallery