Defense Secretary Chuck Hagel stands as Army Gen. Lloyd J. Austin III holds the the U.S. Central Command colors after Marine Corps Gen. James N. Mattis, left, passed the command to Austin during the change-of-command ceremony on MacDill Air Force Base in Tampa, Fla., March 22, 2013. Defense Secretary Chuck Hagel stands as Army Gen. Lloyd J. Austin III holds the the U.S. Central Command colors after Marine Corps Gen. James N. Mattis, left, passed the command to Austin during the change-of-command ceremony on MacDill Air Force Base in Tampa, Fla., March 22, 2013. SHARE: Download: Full Size (7.64 MB) Tags: Photo Essays Credit: VIRIN: 959632-V-UAH00-221.jpg Photo Gallery