Airman 1st Class Thomas Thompson takes soil and water samples during an Oil Spill Response Exercise Nov. 29 at Langley Air Force Base, Va. The oil spill exercise was designed to test the reaction and response times as well as recovery process of Langley AFB members if an environmental mishap were to take place on the installation. Airman Thompson is a 1st Aerospace Medical Squadron Bioenvironmental engineer. (U.S. Air Force photo/Staff Sgt. Samuel Rogers)