As the Cold War progressed, the military intelligence provided by the German section of US Army Historical Division became increasingly important to the Americans.[77] Halder oversaw the German section of the research programme which became known as the "Halder Group".[78] His group produced over 2,500 major historical manuscripts from over 700 distinct German authors detailing World War II.[79] Halder used the group to reinvent war-time history using truth, half-truth, distortion and lies.[35] He set up a "Control group" of trusted former Nazi officers who vetted all the manuscripts and required the authors to change the content.[80] Halder's deputy in the group was Adolf Heusinger who was also working for the Gehlen Organization, the United States military intelligence organisation in Germany.[65] Halder expected to be called "General" by the writing teams and behaved as their commanding officer while dealing with their manuscripts.[81] His aim was to exonerate German army personnel from the atrocities they had committed.[82]