U.S. Air Force loadmasters from the 39th Airlift Squadron prepare to drop an Improvised Container Delivery System bundle, July 29, 2015, at Dyess Air Force Base, Texas. An ICDS derives from a traditional Container Delivery System but uses a sonde, an instrument that acts as a Global Positioning System receiver. The sonde is released from the aircraft on the first pass over a drop zone to better calculate the winds throughout the air column. With this information, the aircrew is able to compute a more precise drop point to achieve the most accurate delivery to the drop zone (U.S. Air Force photo by Airman 1st Class Autumn Velez/Released).