[1] He joined the Luftwaffe and after pilot training,[Note 1] was posted to I. Gruppe (1st group) of Jagdgeschwader 134 "Horst Wessel".

[4] Following his return from Spain, Lippert was posted I. Gruppe of Jagdgeschwader 133 (JG 133—133rd Fighter Wing) based at Wiesbaden-Erbenheim Airfield.

[5] World War II in Europe began on Friday, 1 September 1939, when German forces invaded Poland.

[7] Four days later, Lippert claimed his first victory of World War II on 30 September 1939, a French Morane-Saulnier M.S.406 fighter.

[7] Lippert claimed his second aerial victory on 7 April 1940, a Royal Air Force (RAF) Supermarine Spitfire.

Gruppe participated in Operation "Loge", 350 bombers escorted by 648 fighters, attacked various targets in the greater London area.

[14] Together with Oberleutnant Hans "Assi" Hahn, the presentation was made by Reichsmarschall Hermann Göring, the Commander-in-Chief of the Luftwaffe, at his residence Carinhall.

Gruppe was moved to a makeshift airfield name Praszniki, located northeast of Suwałki close to the Curzon Line, on 18 June.

Here, the Gruppe was equipped with the Bf 109 F-4 and prepared for combat in North Africa to support a German contingent, the Deutsche Afrika Korps under the command of Erwin Rommel.

On 29 September, the Gruppenstab (headquarters unit) under command of Lippert began the relocation to Ayn al-Ġazāla where they were subordinated to the Fliegerführer Afrika, Generalmajor Stefan Fröhlich.

Lippert led a flight of six Bf 109s on a mission which intercepted a flight of Hurricane fighters of the South African Air Force (SAAF) 1 Squadron which lost two Hurricanes, one of which claimed by Lippert in the area south of Buq Buq.

[23] On 23 November, five days after British forces had launched Operation Crusader, Lippert was shot down over Allied lines near Bir el Gubi, probably by Flight Lieutenant Clive Caldwell of No.