COLUMBUS, Ohio —Moral injury is “an injury of the soul,” as Army veteran Matt Zeller tells it.

Zeller, 40, served in Afghanistan and said the United States gave the Taliban power when it left behind Afghans who had been promised safety for helping soldiers during the military withdrawal from there in August 2021, following 20 years of war.

“It’s an injury that the Taliban gets to keep killing Americans with,” he said during a visit to Ohio to meet with the staff of retiring GOP Sen. Rob Portman and advocate for the Afghan Adjustment Act, which would help Afghans who fled here for safety reasons stay permanently.

Zeller, of Fairfax, Virginia, knows of five veterans who died by suicide during the evacuation of Afghanistan following the fall of Kabul.

About 41% of veterans are morally injured, according to statistics from Iraq and Afghanistan Veterans of America, where Zeller is a senior adviser.

“It’s pretty insidious,” he said.

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It can manifest in veterans feeling as if they failed in their mission because Afghans who served alongside them were left behind, said Zeller and James Powers, a fellow Army veteran, who lives in Canton, Ohio.

Here’s more information on moral injury and how it can impact veterans:

What is ‘moral injury’?

Moral injury is defined by the Department of Veterans Affairs as stemming from participating in killing or harming others in warfare, witnessing deaths or failing to prevent immoral acts.

It can result from traumatic or unusually stressful situations where people may carry out, fail to prevent, or witness events that contradict their deeply held moral beliefs and expectations, according to Sonya Norman, director of the post-traumatic stress disorder consultation program at the National Center for PTSD. It manifests as guilt, shame, disgust, anger, loss of trust and sense of self as well as difficulty forgiving oneself, she told The Dispatch, a part of the USA TODAY Network.