Tech. Sgt. Vince Stokes, 141st Air Refueling Squadron book operator, walks through a KC-135R Stratotanker at Fairchild Air Force Base, Wash. May 6, 2021. The KC-135 provides an aerial refueling capability excelling in the role for more than 60 years. (U.S. Air National Guard photo by Master Sgt. Matt Hecht)