Airman Joshua Chapman, 362nd Training Squadron A-10 crew chief apprentice course student. waits to jar the landing struts on top of the wing of an A-10 Thunderbolt II. The struts are jarred during pre-flight procedures so they don't bind during servicing. Chapman and his classmates are on block five of six and are scheduled to graduate soon. (U.S. Air Force photo by Senior Airman Robert L. McIlrath)