At the 173rd Fighter Wing the main fuel storage tank stands empty for about two weeks while crews perform maintenance to ensure its safe operation for the next decade, Aug. 21, 2019. The tank stands more than 50 feet high, and can hold more than half-a-million gallons of jet fuel, a critical component to the heavy flying schedule making this a rare occasion at Kingsley Field in Klamath Falls, Oregon. (U.S. Air National Guard photo by Master Sgt. Jefferson Thompson)