While in medical school at the Uniformed Services University of Health Sciences from 1997 to 2003, Hasan received a string of below average and failing grades, was put on academic probation and showed little motivation to learn.
He took six years to graduate from the university in Bethesda, Md., instead of the customary four, according to the school. The delays were due in part to the deaths of his father in 1998 and his mother in 2001. Yet the information about his academic probation and bad grades wasn't included in his military personnel file, leaving the impression he was ready for more intense instruction.
In June 2003, Hasan started a four-year psychiatry internship and residency at Walter Reed Army Medical Center in Washington, D.C., and he was counseled frequently for deficiencies in his performance. Teachers and colleagues described him as a below average student.
...Still, Hasan's officer evaluation reports were consistently more positive, usually describing his performance as satisfactory and at least twice as outstanding. Known as "OERs," the reports are used to determine promotions and assignments. The Army promoted Hasan to captain in 2003 and to major in 2009.
You really ought to go read it all. As long as your blood pressure meds are handy.