A system of rollers in the floor of C-17 Globemaster III aircraft help airmen push palletized cargo onto the plane at an undisclosed air base here Nov. 3, 2010. Known informally as “Port Dogs,” Aerial port airmen inspect and palletize all cargo before shipment, from food and water to ammunition and rolling stock. They also work closely with aircraft loadmasters to carefully position the cargo inside aircraft, loading it into planes with massive forklifts or special flat-bed trucks known as K-loaders. (Photo by: Senior Airman Laura Turner)