The document unsealed at the request of the Chicago Tribune showed that he was not given his favourite assignment, as the Lashkar leaders wanted to use him for something else.
According to the new documents, it was in February 2002, Headley began attending training camps in Pakistan for LeT.
By December 2003, Headley had attended five separate courses, and had been trained in, among other topics, Lashkar''s philosophy, the use of weapons and grenades, combat tactics, survival skills and counter surveillance methods.
After completing several camps, Headley became acquainted with a senior member of Lashkar Zakir Lakhvi (''Zaki''), who was responsible for Lashkar's military operations.
Headley was anxious to be assigned to an operational assignment in Kashmir, but Zaki told Headley that he was saving Headley for a different assignment.
In July 2004, Headley attended a leadership course with Lashkar senior and junior leadership, the federal prosecutors said in the unsealed documents.
At that course, Zaki made a presentation regarding the killing of an Indian citizen who accepted money from Lashkar, but was then believed to have provided information about Lashkar activities to the Indian military. Zaki showed a computer animation depicting how the killing was carried out.