Master Sgt. William Porterfield, weapons-load crew chief, ensures his team's compliance with technical-order checklists during an A-10 Thunderbolt II weapons- load competition at Whiteman Air Force Base, Mo. The competition is designed to hone the loaders' skills in safely and quickly rearming an A-10 after a combat sortie. Sergeant Porterfield is an Air Force reservist in the 442nd Aircraft Maintenance Squadron, part of the 442nd Fighter Wing, based at Whiteman. (U.S. Air Force photo/Senior Airman Danielle Wolf)