But, during Infantry Officer School, they had a 6 mile version. We started at the Confidence Course, which we did in reverse, and then looped through the woods and picked up the Day Movement course.
As you recall, there was a big difference between the summer months vs fall/winter. And of course, doing it in PT gear vs helmet, flak jacket, rifle and boots.
The all time worse was a hot humid summer day during The Basic School. It was NBC gear training and we humped on the washboard (tank trails) and then did small unit tactical maneuvers. About 4 hours straight in the snowmobile outfits. Sucksville!