Col. Darren Hartford, 437th Airlift Wing commander, presents Master Sgt. Gregory Butler, 437th Aircraft Maintenance Squadron Air Force Special Operations of the 21st Century program manager, the AFSO21 Century Green Belt Qualification certificate March 5, 2013, at Joint Base Charleston – Air Base, S.C. AFSO21 focuses on generating efficiencies and improving combat capability across the Air Force. (Courtesy photo)