I noticed he seems to have posted a photo of his camouflage uniform? Pretty sure those are unique to every soldier...
No, they are a very standard pattern.
Maybe GP was thinking about lining up specific pattern features with e.g. pockets and seams to identify a particular uniform.
Can you show me an image where 2 soldiers, both wearing fatigues, have an identical camouflage pattern? Every image I find on Google Images has a distinct pattern per soldier.
It isn't a per-soldier thing. It's just pieces of fabric that are all cut differently. They aren't out there making sure one person has a specific pattern that matches every single one of their uniforms, and doesn't match someone else's.
I get the line of thinking, and I tend to agree that if they really wanted to, they could figure out a way to match the pattern of a uniform to the person if the person had published a picture of themselves wearing the article on something like Facebook.
But that's a big if. When I was in the military, I think I posted like one picture of me in camo and the resolution was so low that you probably didn't have enough detail to come to any conclusions.
The US has about 24K soldiers in Korea. That's not that many. Presumably they stand at attention every so often anyways. So photograph them all standing at attention and match the camo.
They aren't issued to you. You just buy them at the post exchange. You can buy one pair or 30. You can buy new ones every three years or every three weeks. The Army has no database mapping every specific pants pattern ever sold to a particular buyer, let alone a particular wearer, as junior enlisted who aren't married live in shared barracks and are perfectly able to share clothing if they wear the same size.