Taking care of business

Staff Sgt. Rodney McElfresh, 445th Aircraft Maintenance Squadron crew chief, services liquid oxygen into a C-17 Globemaster III here August 9, 2017. Liquid oxygen is converted to gas in the aircraft which is then used for aircrew in case of emergency as well as for Aeromedical Evacuation patients when in transport. (U.S. Air Force photo/Master Sgt. Patrick O’Reilly)

Staff Sgt. Rodney McElfresh, 445th Aircraft Maintenance Squadron crew chief, services liquid oxygen into a C-17 Globemaster III here August 9, 2017. Liquid oxygen is converted to gas in the aircraft which is then used for aircrew in case of emergency as well as for Aeromedical Evacuation patients when in transport. (U.S. Air Force photo/Master Sgt. Patrick O’Reilly)

WRIGHT-PATTERSON AIR FORCE BASE, Ohio -- Staff Sgt. Rodney McElfresh, 445th Aircraft Maintenance Squadron crew chief, services liquid oxygen into a C-17 Globemaster III here August 9, 2017. Liquid oxygen is converted to gas in the aircraft which is then used for aircrew in case of emergency as well as for Aeromedical Evacuation patients when in transport. (U.S. Air Force photo/Master Sgt. Patrick O’Reilly)