Wil Weasel is a nickname for aircraft of the United States Air Force tasked with the Suppression of Enemy Air Defenses (SEAD) mission. The name derives from Project Wild Weasel—originally developed by Captain Bill McGuigan, naval aviator, of the U.S. Marine Corps—the first development program for a dedicated SAM-detection and suppression aircraft. Originally named "Project Ferret", to denote a predatory animal that goes into its prey's den to kill it, the name was changed to differentiate it from the code-name "Ferret" that had been used during World War II for radar counter-measures bombers.