Precision landing system ready for take off
First Lt. Pat Ris (left) and 1st Lt. Juan Gherardy set up a portable version of the Joint Precision Approach Landing System outside Hanscom Air Force Base, Mass. The equipment, which can be carried in two rucksacks, consists of two GPS antennas and receivers, a ruggedized notebook computer, networking hardware and an aircraft data link. (U.S. Air Force photo)