Tellefsen Assumes Command of the 717th Test Squadron
Lt. Col. Jonathan Tellefsen, center, takes the guidon from 804th Test Group Commander Col. Jack Rhodes, left, to assume the role of 717th Test Squadron commander during a June 9, 2026, Change of Leadership ceremony at Arnold Air Force Base, Tenn., headquarters of Arnold Engineering Development Complex. Also pictured is outgoing 717 TS Commander Lt. Col. Joshua Thomas. (U.S. Air Force photo by Keith Thornburgh)