A U.S. Army soldier with the 65th Engineer Battalion installs culvert denial systems along Highway 1 in Helmand province, Afghanistan, March 24, 2014. The system is comprised of two metal-bar grates that are placed at either end of the culvert and held together by tension force cables, with an anti-tampering device secured to the grates. The device can detect any type of disturbance from vibrations to heat and will initiate a camera to record any tampering with the system.