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From the article:

"This is also a term used to describe high-functioning brain injury survivors because the injury isn't visible, and they appear okay. However, the disability is literally in their head."

By extension, "walking wounded" is also used to describe mental/emotional impairments such as PTSD, depression, and even grief. Here is a reference:

Oxford Dictionary of the US Military (at answers.com)

1. (usually the walking wounded) people who have been injured in a battle but who are still able to walk.

2. people who have suffered emotional wounds.

-- 96.251.99.156 ( talk) 16:06, 31 May 2012 (UTC) reply