U.S. Air Force Senior Master Sgt. Christopher D. Kaleta greets a well-wisher after his retirement ceremony, December 5, 2015 on Barksdale Air Force Base, La. Kaleta is the 307th Logistics Readiness Vehicle Management Flight Chief and is retiring from the Air Force Reserve after more than 20 years of military service. (U.S. Air Force photo by Senior Airman Callie Ware/ Released)