Air Force Master Sgt. Robert Snyder cleans and inspects an oxygen systems valve using an ultra violet light to highlight debris and a cleaning solvent to clear it away as he prepares for takeoff on a C-130H Hercules aircraft as part of a maintenance recovery team at the Mansfield Lahm Air National Guard Base, Ohio, Feb. 20, 2018. Snyder is a crew chief assigned to the Ohio Air National Guard’s 179th Airlift Wing. Air National Guard photo by Tech. Sgt. Joe Harwood