No - everyone in the COC knows the capabilities of a light infantry division. The US Army doesn’t have an active duty specialized mountain unit but it does have a National Guard mountain brigade, as well as a mountain warfare school which trains infantry leaders in mountain warfare tactics. These “Military Mountaineers” are the SME in the line units and provide guidance on training and tactics. Additionally, the Mountain Warfare School also devised training packages for deploying units, as well as deploying cadre to Afghanistan to advise the COC.Pretty sure that when 10th Mountain deployed in a Mountain role, US MIL COC was met with “but we don’t do mountains”. But off they won’t anyway.
Not saying the US mastered mountain warfare in Afghanistan, just pointing out how it fits into doctrine.
86th Infantry Brigade Combat Team - Wikipedia