A veteran of the wars in Iraq and Afghanistan, former Marine Capt. Timothy Kudo thinks of himself as a killer - and he carries the guilt every day
With American troops at war for more than a decade, there's been an unprecedented number of studies into war zone psychology and an evolving understanding of post-traumatic stress disorder.
"I can't forgive myself," he says. "And the people who can forgive me are dead."
Though there may be some overlap in symptoms, moral injuries aren't what most people think of as PTSD, the nightmares and flashbacks of terrifying, life-threatening combat events.
Clinicians suspect some troops are suffering from what they call "moral injuries" - wounds from having done something, or failed to stop something, that violates their moral code.
A moral injury tortures the conscience; symptoms include deep shame, guilt and rage. It's not a medical problem, and it's unclear how to treat it
The Marines, who prefer to call moral injuries "inner conflict," started a few years ago teaching unit leaders to identify the problem.
Killing in war is the issue for some troops who believe they have a moral injury
"You may not have actually done something wrong by the law of war, but by your own humanity you feel that it's wrong,"
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