I spend a lot of my time at various groups and whatnot at my local VA and I see a lot of these guys. Fortunately the doctors and staff usually see right through them.
Even in the VA, it seems that only a small handful of vets were straight Infantry. Fewer yet were legitimate Ranger Regiment guys or Special Forces. Actually, I've only ever met one guy who was a Ranger Regiment guy - and he was MOS'd there as a cook.
Most of the guys I run into even at my PTSD groups were other MOS's. At least when I was in Iraq, a lot of units that you wouldn't think of as combat units were conducting daily patrols. A good buddy of mine was a generator repair tech that they stuck in a HMMWV as a gunner. A lot of times, because many service support jobs were contracted out, people who were cooks and other things were attached to line units and sent out on patrol like us grunts.
When someone tells me they served as an Infantryman, I usually start to roll my eyes at them. Most of the time you can tell just by looking at them that they are full of shit. If they make it past that test, then they give themselves away within the first couple of things they say.
If I'm not mistaken, only 12-15% of the army is actual "infantry". When you factor in the other branches, only something like 7.5% of the military is Infantry.
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