FORT KNOX, Ky.—Instructors rattled out instructions in a well-rehearsed, free verse poem. Nervous ears listened carefully, hoping to gain only a fraction of the Cadre’s confidence. Eyes strained in the light, looking at the top of the 64-foot rappel tower. On June 28, 5th Regiment, Advanced Camp Cadets rappelled. A Cadre member leaned out and introduced himself. Then, he leaned into the “deep-seated L” position over the edge of the tower. Three bounds, and three 4-point checks later, his feet touched the ground. “Notice how they are extending their arm straight back, looking over their brake-hand shoulder,” the instructor said rhythmically. [...]