Corporal David Stewart, combat engineer of Mobility Assault Company, 1st Combat Engineers Battalion, and a native of Issaquah, Wash., observes his Marines as they search for tracks during an exercise for the Tactical Tracking Operation School here on May 14, 2013. The Tactical Tracking Operation School has focused on creating dismounted-based training programs for the Department of Defense and law enforcement agencies. The TTOS program provides visual tracking training and also covers dismounted operations, combat tracking and counter improvised explosive devices training.