U.S. Marine Cpl. Jesse L. Tabor places a cage over a culvert along a busy road to prevent insurgents from inserting explosive materials inside in Helmand province, Afghanistan, on Aug. 19, 2011. Tabor is a metal worker assigned to the 7th Engineer Support Battalion, 2nd Marine Logistics Group. The operation lasted four days and engineers covered nearly 33 miles of Route 606, one of the country's busiest roads. The cages, known as culvert denial systems, will increase safety for troops and travelers.