Those personnel at highest risk of PTSD could be targeted for prevention programs, early intervention after exposure to stress, or even protection from stressful exposures, the report said.
But the study results do not appear definitive enough to prompt such measures, Dohrenwend said.
"Answers on a questionnaire are far from optimal, and they do not have good data on exposure," he said. "So is this enough to base policy on? It probably isn't, but it certainly is enough to follow up with a more intensive investigation of the lowest 15 percent."