The Arctic Commando can be found on the second floor of the Clothing Store and purchased for 140 Bucks. Purchasing this hat will allow you to wear this hat only in Adopt Me!, unless you buy this item from the Roblox Catalog.
The description of this item on the Roblox Catalog reads
"It was good enough for James Bond. It was good enough for all those guys in the last scene of Inception. You're telling me it's not good enough for you?! Get your hat on soldier, and get out there! NAO!"