On 20 May 1944, Wolfrum claimed six aerial victories, an "ace-in-a-day" achievement. He became a double "ace-in-a-day" following eleven aerial victories on 30 May 1944. The next day, he again claimed six aircraft shot down, again making him an "ace-in-a-day". On 1 June 1944, Wolfrum was credited with his 100th aerial victory. He was the 74th Luftwaffe pilot to achieve the century mark. On 16 July, Wolfrum again became a double "ace-in-a-day" when he claimed ten aircraft shot down in combat near Kamionka, northeast of Lviv. Following his tenth victory, he was severely wounded requiring a lengthy period of convalescence. On 31 August 1944, Oberst Dietrich Hrabak, Geschwaderkommodore of Jagdgeschwader 52 submitted a report, requesting a preferential promotion for Wolfrum to Oberleutnant. The application was seconded by General Hans Seidemann, commander-in-chief of the VIII. Fliegerkorps, on 8 September. The request was approved and the promotion backdated to 1 September. At the end of the war, Wolfrum surrendered to the US 90th Infantry Division. After the war he became a successful aerobatics pilot, winning the German Championship in 1962 and taking second place in 1961, 1963, 1964 and 1966.
According to Wolfrum's own account, he and Hans-Ulrich Rudel were in contact in the first years following the end of World War II. The two had briefly met twice during the war. Wolfrum's girlfriend Irene Rühl had a friend who worked for the Americans as a secretary at a hospital in Fürth where Rudel was being treated. With the help of this friend, Rudel's release papers were signed and he was set free. Wolfrum states that he then periodically aided Rudel as a motocycle driver and courier. Additionally, Wolfrum's father helped Rudel's father, Johannes Rudel, find a new home and position as a pastor in Gunzenhausen. At the time, Rudel was getting in contact with his former comrades from Schlachtgeschwader 2. With the aid of these comrades, Rudel had set up a smuggling ring across the various zones of Allied-occupied Germany. The official currency in Germany at the time was still the Reichsmark and its exchange rate varied from zone to zone. Rudel and his men built an illegal business, disguised as a haulage company, around this discrepancy in exchange rates by smuggling large sums of money from one zone to another, buying and selling currency with a profitable margin. Wolfrum states that his contact with Rudel ended in 1948 after Rudel had left for Argentina.
Summary of career
Aerial victory claims
Matthews and Foreman, authors of Luftwaffe Aces — Biographies and Victory Claims, researched the German Federal Archives and state that Wolfrum was credited with 134 aerial victories, plus sixteen further unconfirmed claims. All of his victories were claimed on the Eastern Front. Victory claims were logged to a map-reference, for example "PQ 34 Ost 76891". The Luftwaffe grid map covered all of Europe, western Russia and North Africa and was composed of rectangles measuring 15 minutes of latitude by 30 minutes of longitude, an area of about. These sectors were then subdivided into 36 smaller units to give a location area 3 × 4 km in size.
