Airman 1st Class Bryce Woodall, 28th Aircraft Maintenance Squadron hydraulics systems apprentice, chooses a wrench to remove bolts from a flap slat power drive unit of a B-1B Lancer here, Oct. 29. The flap slat PDU controls the flaps and slats ability to retract during takeoffs and landings. (U.S. Air Force photo/Airman Matthew Flynn)