The AGM-88 HARM is an anti-radar missile used to attack opposing air defenses, most often as part of Suppression of Enemy Air Defenses (SEAD) missions. When launched, it uses its passive radar tracking capabilities to guide itself to the target, and if the target shuts off its radar while the HARM is in flight, the HARM engages its backup inertial navigation system and guides itself to its target's last known position.