4/22/2013 - Senior Airman William Studley, 100th Maintenance Squadron, finishes installing the air cycle machine (ACM) on a KC-135 Stratotanker while deployed with the 351st Expeditionary Air Refueling Squadron April 18, 2013, in Southwest Europe. The ACM feeds air into the fuselage and cockpit of the aircraft to help regulate the internal temperature and climate during flight, which helps keep the aircraft fully functional. (U.S. Air Force photo by 1st Lt. Christopher Mesnard/Released)

4/22/2013 - Airmen with the 100th Maintenance Squadron collect their tools and old parts prior to testing the bleed air on a KC-135 Stratotanker while deployed with the 351st Expeditionary Air Refueling Squadron April 18, 2013, in Southwest Europe. The bleed air is used to help control the climate on the aircraft during flight. (U.S. Air Force photo by 1st Lt. Christopher Mesnard/Released)

4/22/2013 - Airmen with the 100th Maintenance Squadron attach an external power unit to a KC-135 Stratotanker before conducting a test on the aircraft’s bleed-air-cooling system while deployed with the 351st Expeditionary Air Refueling Squadron April 18, 2013, in Southwest Europe. The aircraft needed to be repaired to maintain the integrity of the climate-control system during flight. (U.S. Air Force photo by 1st Lt. Christopher Mesnard/Released)

4/22/2013 - An Airman with the 100th Maintenance Squadron maintenance section monitors the external portion of the air cooling system on a KC-135 Stratotanker while deployed with the 351st Expeditionary Air Refueling Squadron April 18, 2013, in Southwest Europe. The system needed to be repaired to bring the in-flight climate-control back up to full capacity. (U.S. Air Force photo by 1st Lt. Christopher Mesnard/Released)

4/22/2013 - Staff Sgt. Justin Horak, 100th Maintenance Squadron maintenance section, stows the hoses on an external power unit after successfully completing a test of the bleed-air-cooling system while deployed with the 351st Expeditionary Air Refueling Squadron April 18, 2013, in Southwest Europe. The unit provides power to the aircraft, simulating the power it would have during flight and allowing the maintainers to accurately test the air-cooling system. (U.S. Air Force photo by 1st Lt. Christopher Mesnard/Released)