Airman 1st Class Isaac Rehmel, 362nd Training Squadron A-10 crew chief apprentice course student, removes and installs the engine covers on the A-10 Thunderbolt II. Crew chiefs usually remove and reinstall the engine covers on operational A-10's anywhere from two to three times a week for maintenance. Rehmel and his class mates are in the 6th and final block of the 44 academic day course and will be graduating soon (U.S. Air Force photo by Senior Airman Robert L. McIlrath)