The Pentagon changes focused on "tip of the spear" fighters, or those "in the line of duty in a combat zone," said Eileen Lainez, a Pentagon spokeswoman. They comprise "a very special, yet limited, subset of those who matriculate through the Disability Evaluation System," Lainez wrote in an e-mail response to a request for comment.
In many cases, veterans say, they are not told why their disabilities are not considered combat-related.
Dixon said he did not realize he had been put in a noncombat-related category until he began questioning his disability payments. It took more than six months of phone calls, letters and appeals -- plus help from the Disabled American Veterans and a member of Congress -- to overturn his designation.
Navigating the Pentagon's bureaucracy was made more difficult because Dixon's brain injury resulted in short-term memory loss. He had to write everything down in notebooks and calendars.
"It was a nightmare," Dixon said. "Most veterans don't know how the system works, or how to fight it. They don't realize all the obstacles they put in your way to keep you from getting what you deserve."
Meshell said the military disability system was so complex that few veterans were equipped to navigate it.
"I'm a college graduate. I'm not a dumb person. But honestly, I can't begin to explain some of this stuff," she said.
After five years of active duty, a combat tour in Iraq and 12 years in the National Guard and Reserves, she thinks she deserves the full disability benefits authorized by Congress for veterans injured in combat.
"I earned them," she said. "I went to Iraq. I was in combat. I got injured."
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david.zucchino@latimes.com