U.S. Air Force Staff Sgt. Will Sherer, with the 121st Air Refueling Wing, prepares to don his protective mask before firing his weapon during the combat weapons course competition portion of the Air Mobility Rodeo 2011 at Joint Base Lewis-McChord, Wash., July 25, 2011. The Air Mobility Rodeo is the Air Mobility Commands biennial readiness competition. It focuses on improving the professional core abilities of air mobility forces from the U.S. Air Force and Air Force Reserve as well as allied nations.