I suspect that the US Army has more specialized arctic troops than most of NATO combined. In 2022 the 11th Airborne Division was reactivated and is stationed at Joint Base Elmendorf-Richardson and Fort Wainwright in Alaska. It represents a reorganization of two brigades of the 25th Infantry. Numbering around 12,000 troops it is organized around two infantry brigade combat teams, an aviation brigade (including an attack / recon battalion). The division also sponsors the Army's Arctic Warfare school.
Additionally, the 10th Mountain Division, with two of its brigade combat teams stationed at Fort Drum, NY with an annual snowfall often exceeding 200 inches is also trained for winter warfare conditions. This represents roughly another 12,000 troops focused on fighting in such conditions.
And yes, a company of the 11th Airborne did not cover themselves in glory during Exercise Joint Viking, and I rather suspect they quickly were provided new leadership.