DAVIS-MONTHAN AIR FORCE BASE, Ariz. -- Col. Peter Hofelich, 355th Maintenance Group commander, shakes the hand of Lt. Col. Christian Lawlor Sept. 23 after he landed the last KC-135E on Davis-Monthan, where the aircraft will retire after more than 50 years of active service. (U.S. Air Force photo/Airman Jerilyn Quintanilla)