According to Wikipedia: "The Saab 37 Viggen (English: "Tufted duck, ambiguous with ?"Thunderbolt") is a Swedish single-seat, single-engine, short-medium range combat aircraft, manufactured between 1970 and 1990. Several distinctive variants were produced to perform the roles of strike fighter (AJ37), aerial reconnaissance (SF 37), maritime surveillance (SH 37) and a two-seat trainer. In the late 1970s the all-weather fighter-interceptor JA 37 was added."