More than routine maintenance
Mark Heitkotter inspects a KC-135 Stratotanker, built in 1962, during a periodic inspection at Grand Forks Air Force Base, N.D. The KC-135 undergoes rigorous inspections every 15 months or 1,500 flying hours to make sure it is combat ready. Mr. Heitkotter is an electronic systems technician with the 319th Maintenance Squadron. (U.S. Air Force photo/Airman 1st Class Chad Kellum)