U.S. airmen from the 374th Airlift Wing, Yokota Air Base, Japan, load a cargo trailer onto a C-130 Hercules during the Engine Running On/Offload competition which is a part of Air Mobility Rodeo 2011, Joint Base Lewis-McChord, Wash., on July 25, 2011. The ERO is a timed event intended to simulate and expedite on/offload of cargo in a wartime environment using a five member team. Rodeo is the U.S. Air Force's and AMC's premier international combat skills and flying operations competition designed to develop and improve techniques, procedures, and interoperability, while optimizing international mobility partnerships and enhancing mobility operations.