Staff Sgt. Tomas Diaz, 75th Logistics Readiness Squadron, volunteers to sort and bundle holiday cards for distribution throughout Hill Air Force Base, Dec. 16, 2020. More than 21,000 holiday letters were received from the American public through the National Holiday Card Challenge, and sent to our U.S. Armed Forces to express support and grateful appreciation for the service of our military members and their families. (U.S. Air Force photo by Todd Cromar)