Reportedly, the terrain following / avoidance technology of JL-10A was developed from those originally obtained from captured terrain following radars from downed A-6 Intruder and General Dynamics F-111 during the Vietnam War.
The origin of JL-10A's terrain following/avoidance technology is attributed to radar systems recovered from downed A-6 Intruder and General Dynamics F-111 aircraft during the Vietnam War.