ELLSWORTH AIR FORCE BASE, S.D. -- Chief Master Sgt. Brian Lavoie, 28th Operations Group superintendent, signs the Oath of Enlistment for another four years, Aug. 27. Chief Lavoie was sworn in by his son, U.S. Navy Ensign Paul Lavoie, aboard the U.S.S. Pearl Harbor at sea, via a video teleconference. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)