Col. John Walker, 39th Air Base Wing commander, and his wife Ms. Walker, flip the switch to light officially light the tree during the 2015 Incirlik Holiday Tree Lighting ceremony Dec. 1, 2015, at Incirlik Air Base, Turkey. Events of the tree lighting included a speech from Col. John Walker, 39th Air Base Wing commander, a visit from Santa Claus and the singing of holiday carols. (U.S. Air Force photos by Senior Airman Krystal Ardrey/Released)