 The first flight of Sud-Est SE.2410 "Grognard" I (F-ZWRJ) took place on 30 April 1950, while the second prototype (F-ZWRK) flew on 14 February 1951 but suffered from tailplane flutter.Both prototypes underwent many weapons tests, notably becoming the first French aircraft to fire an air-to-air missile (the Matra T-10).The "Grognard" II was heavily damaged in a belly landing after a false fire warning, although the airframe was salvaged and subsequently used as a target for firing tests.