Altus KC-135
ALTUS AIR FORCE BASE, Okla. -- From left, 97th Tanker Sortie Generation Engine Mechanics Kim Cather and Tom Moore work together to install a engine ring cowl during an engine swap of a General Electric F-108 engine, which was overhauled by Tinker Air Force Base, Okla., for a KC-135R Stratotanker in Hangar 523 March 14. The KC-135Rs have been in service for almost 50 years and requires routine maintenance in order to remain operational. (Photo by Senior Airman Clinton Atkins)