Back when the Earth was still cooling (I think it was sometime in the late 1970s) when one dug a hole, large or small depending on quantity, to accommodate human waste during exercises, there was occasion that a small US Army contingent was with us in Wainwright when the weather was appropriate for "winter warfare". One of the items of comfort gear that they had with them was an all metal, collapsible, portable camping toilet. While this may have benefits of durability and ease of cleaning it definitely was not ideal when the temp dipped below freezing. There was more than one Southern gentleman who, unaccustomed to the weather, found himself stuck to the seat.
As for driving in mukluks, I recall a time (also long ago, it might have even been during that Rapier Thrust previously mentioned) when direction came down that drivers had to wear full winter gear (mukluks, parkas, etc) even when behind the wheel. On a couple of previous exercises (including a 1 Fd Amb winter ex in Wainwright) there had been some casualties that resulted following vehicle breakdown/accident when the crew/occupants were left stranded for prolonged periods without adequate cold weather gear.