Santa rings a bell inside the Youth & Family Services center in Rapid City, S.D., Dec. 14, 2016. U.S. Postal Service and Airmen from the 28th Operations Group volunteered as part of their 10th annual Angel Tree program – donating more than 250 gifts to children in Rapid City. (U.S. Air Force photo by Airman 1st Class Randahl J. Jenson)