U.S. Air Force Senior Airman Ken Spruell and Airman 1st Class Justin Marcum, 437th Maintenance Squadron aircraft metals technology specialists, Joint Base Charleston, S.C., mask parts of a C-17 Globemaster III before being painted at JB Charleston - Air Base, S.C., May 9, 2012. The airmen mask parts of the C-17 to prevent them from being painted with the rest of the plane.