NASHVILLE, Tenn. — They crawled through mud and climbed over hurdles. They worked together to solve puzzles in which they were the pieces. They looked over the ledge of a wall 40 feet in the air and rappelled down its sheer face. Only after all of that did members of the Vanderbilt lacrosse team relax and pose for photos with the U.S. Army officers and enlisted men and women who guided them through their adventures at Fort Campbell in Kentucky. The Commodores were exhausted but exhilarated.