Career
Pietrzak joined the Polish Air Force in 1933, and during the Invasion of Poland, piloted PZL.23 Karaś light bombers and later flew fighters with the Free French Air Force"s Government College III/9 squadron. He joined Number. 306 Polish Fighter Squadron as a Sergeant Pilot in August 1941, flying Hawker Hurricanes and Supermarine Spitfires, and was commissioned the following year, eventually becoming a Squadron Leader. On 31 December 1942 while flying a Spitfire Mk IX (Serial Number EN128) he scored the 500th victory for the United Kingdom based Polish Air Force in the war and was later decorated by Polish President Władysław Raczkiewicz.
After starting a second tour with 306 Sqn he joined 315 Polish Fighter Squadron from July 1944 until October 1944, flying P-51 Mustang IIIs.
He was awarded the Distinguished Flying Cross in August 1944. His score was 7 ( and 2 shared) claimed destroyed and 2 damaged.
All his victims were German fighter planes: 3 Messerschmitt Bf 109s and 4.5 Focke-Wulf Fw 190s. He is also credited with destroying four V-1 flying bombs.
