Not necessarily. It could simply imply "clumsy dork." I'm not the only person to ever hit my thumb with a hammer, or drop something on my foot--although I've ever gotten a medal for it.
re: self-inflicted implies intentional
I agree! There are lots of words and phrases that sound like one thing but have a definite meaning in medicine, law, etc. Like the term 'dull normal' or the word insult when talking about a heart attack. Self-inflicted means one thing to the casual observer but something entirely different to a military person.