A U.S. Army Advanced Individual Training student assigned to the 222nd Aviation Regiment, 1st Aviation Battalion, 128th Aviation Brigade, works on the Doppler Radar System during an AH-64 Armament/Electrical/Avionic Systems Repairer course at Joint Base Langley-Eustis, Virginia, June 10, 2019. The students’ knowledge of the AH-64’s various systems and components, including weapons and sighting systems, fire control units, avionics and stabilization systems, are the foundation for mission safety and success. (U.S. Air Force photo by Airman 1st Class Monica Roybal)