The Army Sees Mortars as Safe. Troops Report Signs of Brain Injury.

Soldiers exposed to thousands of low-level blasts from firing weapons like mortars say that they wind up with debilitating symptoms of traumatic brain injury — but no diagnosis.

After firing about 10,000 mortar rounds during four years of training, one soldier who joined the Army with near-perfect scores on the military aptitude test was struggling to read or do basic math.

Another soldier started having unexplained fits in which his internal sense of time would suddenly come unmoored, sending everything around him whirling in fast-forward.

A third, Sgt. Michael Devaul, drove home from a day of mortar training in such a daze that he pulled into a driveway, only to realize that he was not at his house but at his parents’ house an hour away. He had no idea how he got there.

“Guys are getting destroyed,” said Sergeant Devaul, who has fired mortars in the Missouri National Guard for more than 10 years. “Heads pounding, not being able to think straight or walk straight. You go to the medic. They say you are just dehydrated, drink water.”

All three soldiers fired the 120-millimeter heavy mortar — a steel tube about the height of a man, used widely in training and combat, that unleashes enough explosive force to hurl a 31-pound bomb four miles. The heads of the soldiers who fire it are just inches from the blast.

The military says that those blasts are not powerful enough to cause brain injuries. But soldiers say that the Army is not seeing the evidence sitting in its own hospital waiting rooms.