717th ABS receives new commander Published July 15, 2015 By 1st Lt. Leah Davis Office of Defense Cooperation-Turkey Ankara, Turkey -- Lt. Col. Mack Coker took command of the 717th Air Base Squadron during a change of command ceremony June 2, at the Ankara Support Facility, here. Prior to taking command, Coker was the deputy chief, Department of Defense Next Generation Lead Service Office, Headquarters Air Force, Pentagon, Washington D.C. A change of command ceremony is a tradition that represents a formal transfer of authority and responsibility from the outgoing commander to the incoming commander. The 717th ABS is a geographically separated unit of the 39th Air Base Wing and its mission is to support the Department of Defense, NATO and embassy entities in the Ankara, Istanbul and Eskeşehir areas in Turkey.