Reinecke joined the German Imperial Army as a cadet in March 1905. He served throughout World War I during which he was awarded the Iron Cross first class and he was promoted to captain in 1916. He then continued his military service in the Reichswehr with the Army Office of Administration, an infantry regiment and the Reich Defence Ministry in Berlin. He served in the Wehrmacht, providing political training on behalf of the Nazi leadership. In January 1939, Reinecke was promoted to major general as head of an office in the OKW and appointed head of the General Office of the Armed Forces at OKW '' in August 1940. Reinecke was also head of the office for the NSFO, which consisted of Nazi officers charged with political propaganda in the Wehrmacht. Major Karl August Meinel was shifted into the Führerreserve on 1 August 1942, because on 13 January 1942 he wrote a critical report to Hermann Reinecke on the segregation and execution of Soviet prisoners of war in prison camp Stalag VII A by the Gestapo and the Sicherheitsdienst SD of the Reichsführer SS. In 1942 Reinecke was promoted to General of the Infantry. Following the 20 July plot coup attempt, Joseph Goebbels tasked him with retaking the Bendlerblock, and he was then an assessor on the judging panel at the People's Court trials of the conspirators.
Trial and conviction
In the High Command Trial, as part of the Nuremberg Trials after World War II, Reinecke was convicted of war crimes and crimes against humanity. As head of the General Office of the Armed Forces, he was responsible for the creation and implementation of the POW policy that resulted in the deaths of approx. 3.3 million Soviet prisoners of war. The judgement of the International Military Tribunal refers to 8 September 1941 regulations for the treatment of Soviet prisoners of war in all prisoner of war camps, signed by General Reinecke, the head of the prisoner of war department of the High Command. These orders stated:
The Bolshevist soldier has therefore lost all claim to treatment as an honourable opponent, in accordance with the Geneva Convention The order for ruthless and energetic action must be given at the slightest indication of insubordination, especially in the case of Bolshevist fanatics. Insubordination, active or passive resistance, must be broken immediately by force of arms ... Anyone carrying out the order who does not use his weapons, or does so with insufficient energy, is punishable Prisoners of war attempting escape are to be fired on without previous challenge. No warning shot must ever be fired.... The use of arms against prisoners of war is as a rule legal.
Reinecke was sentenced to life imprisonment. His sentence was reviewed by the "Peck Panel". He was released in October 1954.