Master Sgt. Bradley Allred, 374th Medical Support Squadron medical contingency operations section chief, explains the initial staging portion of the En Route Patient Staging System to the members of the USO Spring Tour at Yokota Air Base, Japan, April 22, 2018. The tour, hosted by Gen. Paul Selva, Vice Chairman of the Joint Chiefs of Staff, included writer and comedian Jon Stewart, country music artist and U.S. Army veteran Craig Morgan, celebrity chef Robert Irvine, UFC fighters Paige VanZant and Max Holloway, as well as retired NBA player Richard “Rip” Hamilton. (U.S. Air Force Photo by Airman 1st Class Matthew Gilmore)