 Munir Redfa, in a defection pre-arranged by the Israeli Mossad Intelligence Agency, flew it to Israel during a training flight.In this multi-service project, Air Force and United States Navy pilots evaluated the MiG-21, redesignated as the "YF-110", in a variety of situations.The project's name came from the "doughnut" shaped sight reticle on the F-4 Phantom's canopy used to aim at opposing aircraft.