Master Sgt. Robert Snyder, Crew Chief, cleans and inspects an oxygen systems valve using an ultra violet light to highlight any debris and a cleaning solvent to clear any debris as he prepares to fly on the C-130H Hercules as part of a Maintenance Recovery Team (MRT), Feb. 20, 2018, at the 179th AW, Mansfield, Ohio. Crew Chiefs become part of the aircrew when flying and the MRT is flying to perform maintenance on another aircraft that has recently received upgrades while in Ogden, Utah. ( Air National Guard

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