Retired U.S. Air Force Col. Kevin Wolfe, former 307th Mission Support Group commander, presents the Certificate of Retirement to Chief Master Sgt. Douglas McClain during a ceremony on Nov. 1, 2014, Barksdale Air Force Base, La. McClain is retiring from the Air Force Reserve after more than 30 years of service. (U.S. Air Force photo by Master Sgt. Greg Steele/Released)