Nutritionist in the US Army?

I don't mean to sound ignorant, but before I go on a wild goose chase, can someone tell me if there are enlisted/officer nutritionists in the US Army? I know when people are flagged, I've heard they get referred to a nutritionist, but I've never had that problem, so I don't know if they are civilian nutritionists or soldier nutritionists? Any help is appreciated, thanks!