Private First Class Colin Ambrose, Mobility Assault Company, a combat engineer serving with 1st Combat Engineers Battalion, examines boot tracks left by an instructor of Tactical Tracking Operation School here on May 14, 2013. The program's visual tracking techniques can be used in any type of terrain, from mountains to jungle, from desert to tundra, cities to wilderness, day and night. Private First Class Colin Ambrose, Mobility Assault Company, a combat engineer serving with 1st Combat Engineers Battalion, examines boot tracks left by an instructor of Tactical Tracking Operation School here on May 14, 2013. The program's visual tracking techniques can be used in any type of terrain, from mountains to jungle, from desert to tundra, cities to wilderness, day and night.