Stephen Kobelas, Vietnam War veteran, boards a C-20 aircraft with Col. Kevin Schiller, 375th Operations Group commander, during a 457th Airlift Squadron tour at Joint Base Andrews, Md., June 30, 2017. Kobelas was a C-7 Caribou aircraft pilot assigned to the 457th Tactical Airlift Squadron during the Vietnam War. The tour was part of the 457th AS’s 75th anniversary celebration. (U.S. Air Force photo by Airman 1st Class Rustie Kramer)