'With these blast exposures, they might knock you down–the blast wind–but you may not come away with an injury. But even with that kind of exposure and no visible injuries, you go deeper into the brain, into these synapses, you start to see defects, which suggests you could have cognitive behavior issues,' Gregory said in an interview with Military.com.
The finding may explain why service members returning from war zones without any detectable injuries have neurological symptoms such as depression, headaches, irritability and memory problems, added Ben Bahr, a biochemist at UNC-Pembroke.
'Studies linking blast exposures and traumatic brain injury, even mild TBI, to an increased risk of Alzheimer's disease are numerous,' said Bahr.
※ war zone:
A region where a war is in progress.
After war zone scandals, US special operators are curbing deployments and investing ethics training.