Master Sgt. Harold Martin, 403rd Maintenance Squadron maintenance shop supervisor, performs routine maintenance on a nitrogen cart at the Henry E. Rohlsen Airport in St. Croix, U.S. Virgin Islands May 5-11, 2014. The nitrogen cart is primarily used to put air in the tires on the WC130-J aircraft during the hurricane season. (U.S. Air Force photo/Master Sgt. Jessica L. Kendziorek)