An easy pace is all they need, for now anyway. He can sort of tell if he gets to thinking too hard he'll keep going faster and then faster and faster until he outruns his feet. Duke, well trained, heels as they run. "Well, I'm in the army now. Maybe we'll have a reason to go out and I can see it then." Would it look like the Martian sky, he wonders? Would it remind him at all of home?