EC-130 tune-up
Airman Nick Sinwell installs safety wire on the dome of an EC-130 Compass Call propeller while Staff Sgt. Sam Gaare tightens a drain valve on the engine at Davis-Monthan Air Force Base, Ariz., on July 18. Both Airmen are assigned to the 355th Equipment Maintenance Squadron. (U.S. Air Force photo/Airman 1st Class Veronica Pierce)