The FAF's main mission was to achieve air superiority over Finland and prevent Soviet air power from reinforcing their front lines. The fighter squadrons were very successful in the Finnish offensive of 1941. A stripped-down, more maneuverable, and significantly lightened version of the American Brewster Buffalo was the FAF's main fighter until 1943. Results with this fighter were very good, even though the type was considered to be a failure in the US Navy and with British and Dutch Far East forces. In Finnish use, the Brewster had a victory rate of 32:1 – 459 kills to 15 losses. German Bf 109s replaced the Brewster as the primary front-line fighter of the FAF in 1943, though the Buffalos continued in secondary roles until the end of the wars. Other types, especially the Italian Fiat G.50 and Curtiss Hawk 75, also proved capable in the hands of well-trained Finnish pilots. Various Russian designs also saw action when lightly damaged "kills" were repaired and made airworthy.