Air Force Senior Airman Brandon M. Acks refills a C-130H Hercules aircraft with liquid oxygen at the 179th Airlift Wing, Mansfield Lahm Air National Guard Base, Mansfield, Ohio, Aug. 30, 2018. Acks is a crew chief assigned to the Ohio Air National Guard’s 179th Airlift Wing Maintenance Group. The C-130 aircraft holds 24 liters of liquid oxygen and is used to ensure air crew have oxygen when flying at high altitudes. Air National Guard photo by Airman Alexis Wade