Airmen with the 46th Test Squadron at Eglin Air Force Base, Florida, worked for several months to learn the setup process and basic maintenance of the D-ILS system. Their efforts will help standardize the setup checklists all air traffic control systems Airmen will use assembling D-ILS units around the globe. Developed runways have permanent systems, but undeveloped runways sometimes have no electronic landing system capability. D-ILS provides instrument landing capabilities where they never existed, or where they have been degraded by enemy action or natural disasters. It facilitates humanitarian relief operations and supports the 24-hour, 365-day potential operational footprint of the U.S. Air Force.