THIS BOOK FOCUSES ON THE SOVIET ACES WHO SCORED ALL, OR MOST OF THEIR VICTORIES IN THE YAK, DRAWING INFORMATION FROM OFFICIAL UNIT HISTORIES AND MEMOIRS OF THE SOVIET PILOTS THEMSELVES. The Yak-1 entered Soviet service in 1941, one of three modern types of aircraft accepted for production just prior to the German invasion of the USSR. Despite initial shortcomings, it soon proved to be the thoroughbred of the Soviet Airforce. Indeed, it remained in production until the end of the war, modernized but fundamentally recognizable. By VE-day about 33,100 Yakovlev fighters had been built. Virtually all Soviet fighter regiments flew at least one variety of Yak for a time, including those which gained their fame identified with other aircraft, and consequently many pilots known as Airacobra or Lavochkin aces also scored victories with the Yak. Many other famous aces were exclusively 'Yak patriots', including the French Normandie pilots.