US Air Force (USAF) Airmen assigned to the 819th/219th Expeditionary Red Horse Squadrons (ERHS), operate a John Deere 772 motor road grader equipped with Global Positioning System (GPS) technology, while conducting a runway construction project, at an undisclosed forward deployed location, during Operation ENDURING FREEDOM. The GPS automatically controls the elevation of the blade to an accuracy of 1-centimeter (cm), eliminating the need for stakes, saving time and man-hours