Dr. Tyler Smith's Publication: A comparison of mental health outcomes in persons entering U.S. Military Service before and after September 11, 2011.
Wells TS, Ryan MAK, Jones KA, Hooper TI, Boyko EJ, Jacobson IG, Smith TC, Gackstetter GD. A comparison of mental health outcomes in persons entering U.S. Military Service before and after September 11, 2001. Journal of Traumatic Stress. 2012 Feb (25):17-24.
It is hypothesized that those who entered military service prior to September 11, 2001 might have had expectations of experiencing a regular operational tempo and less combat compared with those entering service after this date, therefore an increased risk for mental disorders. Although measuring the direct reason for entering the military was not possible for this study, the findings showed that those entering pre-September 11 did not have a higher odds of mental disorders, suggesting that mental disorders resulting from the experience of war are common across the pre- and post-September 11 accession eras.