Maj. John Stock, 370th Flight Test Squadron chief of training, explains features of a KC-135 to Col. Christopher Zidek, 413th Flight Test Group commander, Sep. 11, 2018, at Edwards Air Force Base, Calif. This was Zidek’s first visit to the 370th FLTS since taking over as commander of the 413th FTG. (U.S. Air Force photo by Jamal D. Sutter)