This is the U.S. Army and Air Force Standard-Issue Advanced Combat Shirt (ACS), Type I (Crew Collar), also known as the "Army Combat Shirt." MultiCam. It's a medium-size NSN: 8415-01-580-4853. It's new with tags, never worn, and still has the original manufacturer's scent. It's great for a field exercise or a deployment where you are authorized to wear it instead of your ACU top.