When I first started fighting wildland/urban interface fires years ago, I quickly learned to carry a pack of moistened butt wipes in my wildlands pack. Nothing worse than being up some canyon all night doing structure protection and having to use tp out of an MRE. I don’t mind crapping in a dug hole, but I’m all about the comfort when having to do so.
Now I always carry in the Jeep too.
Having been an 11 Bravo in the Army, I can relate to this 100% and then some. I became very close with wet wipes in the field