Crew Chiefs keep KC-135R Stratotankers at a high level of performance
Airman 1st Class Colby Mercil, a Crew Chief assigned to U.S. Air Force aircraft 80104, a KC-135R Stratotanker, inpects the axle parts of a nose gear while installing a new tire on April 10, 2012. Airman Mercil, from Colorado Springs, Col., is assigned to the 906th Air Refueling Squadron, an active duty Air Force unit that is associated with the 126th Air Refueling Wing, Illinois National Guard, at Scot AFB, Ill. Crew chiefs perform and oversee everyday maintenance to aircraft. They recover and inspect aircraft after a flight, change tires and brakes, service engine oil and hydraulic fluid, and execute numerous inspections. They ensure an aircraft is safe and reliable. (National Guard photo by Master Sgt. Ken Stephens)