Air Force Senior Airman Brandon M. Acks monitors a control valve as a C-130H Hercules aircraft is being refilled 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. Air National Guard photo by Airman Alexis Wade