In 1991, Idaho's Air Guard changed aircraft and mission again. The unarmed RF-4C Phantom jets were replaced by F‑4G Phantom II "Wild Weasel" Electronic Warfare aircraft received from the 37th Tactical Fighter Wing at George AFB, California. The F-4G was designed as an anti-Surface to Air Missile aircraft to jam and attack enemy radars when they were activated. "Wild Weasel" tactics and techniques were first developed in 1965 during the Vietnam War, and were later integrated into the Suppression of Enemy Air Defenses (SEAD) a plan used by US air forces to establish immediate air control, prior to possible full-scale conflict.