Members of the U.S. Air Force Band Singing Sergeants sing Christmas Carols during a performance at the Strathmore Theatre in Bethesda, Md., Dec 1, 2015. The Air Force Band is the Air Force’s premier musical organization. The excellence demonstrated by the Band’s Airmen is a reflection of the excellence carried out 24 hours a day by Airmen stationed around the globe. (U.S. Air Force photo/ Airman 1st Class J.D. Maidens/ released)